24V Car NOx Nitrogen Oxide Sensor 5297478 5WK96754C For Freightliner

5WK96754B/5WK96754C Car NOx Sensor Nitrogen Oxide Sensor 4326867/5297478

The 5WK96754B is a planar dual-cell limiting current type nitrogen oxide (NOx) sensor designed for 24V heavy-duty diesel engine exhaust aftertreatment systems equipped with Selective Catalytic Reduction (SCR). It is an electrochemical sensor that continuously measures the concentration of nitrogen oxides (NOx) and oxygen (O₂) in the exhaust stream and communicates with the Engine Control Unit via digital CAN bus protocol (typically SAE J1939). This real-time feedback enables precise control of the SCR system and ensures compliance with EPA 2010, Euro V, China V/VI, and equivalent emission standards.

The sensor features HTCC (High-Temperature Co-fired Ceramic) technology, consisting of a ceramic sensor element and an integrated electronic control unit (ECU), forming a single unit installed directly in the exhaust gas system. It is designed to withstand harsh operating conditions, including high vibration, extreme temperatures, and exposure to corrosive exhaust gases, making it particularly suitable for heavy-duty on-highway and off-highway applications. The sensor independently calculates the NOx concentration and transmits this data via digital CAN messages, used by the SCR controller to adjust Diesel Exhaust Fluid injection for optimal NOx reduction. It also performs self-diagnostics and reports system health to the engine ECU.

The NOx sensor transmits the NOx value in the exhaust gas to the ECU in real time after normal operation. The ECU monitors whether the NOx value in the exhaust gas exceeds the standard through a set of NOx monitoring programs. The sensor not only provides accurate NOx measurement but also detects sensor aging, contamination, and signal reliability issues, allowing the ECU to take appropriate actions such as derating engine power to prevent emissions exceedance.

Most engines equipped with SCR aftertreatment systems utilize two NOx sensors:

• Upstream (inlet / pre-SCR) — installed before the SCR catalyst, measuring raw engine-out NOx, providing real-time feedback to precisely meter Diesel Exhaust Fluid (DEF) injection

• Downstream (outlet / post-SCR) — installed after the SCR catalyst, measuring treated exhaust, used mainly to confirm that legislated emissions limits have not been exceeded and to monitor SCR catalyst efficiency

Important: The 5WK96754B operates on a 24V system voltage. This is a critical specification — many other NOx sensors in the 5WK96xxx series (particularly those with "A" or no suffix variants) are designed for 12V systems. Always verify your vehicle‘s electrical system voltage before purchase. Do not install on 12V systems as the sensor will not reach proper operating temperature, leading to persistent faults and potential heater damage over time. The 5WK96754B is a component of the Controlled Emission System (CES) , developed specifically for heavy-duty commercial vehicle platforms.

The following part numbers are directly interchangeable with 5WK96754B. When searching for a replacement, these numbers may appear on the original sensor label, in supplier catalogs, or in vehicle manufacturer documentation. Always verify physical connector type, voltage rating (24V), thread size, and cable length before purchasing.

From multiple supplier sources, the following cross-references have been verified:

• A nitrogen oxide sensor listing for Cummins engines shows replacement part numbers: 4326867, 5WK96754C, 4326867RX, 5WK96754B.

• A Continental replacement sensor cross-references: 4326867, 5WK9 6754C, 5WK96754C.

• An OEM truck sensor listing for Cummins includes cross-references: 4326867, A045S161, A2C95994000-01 for 5WK96754C.

• An eBay listing confirms 5WK9 6754C is cross-referenced with Cummins SNS CES 4326867 A045S161 2897314 E4326867.

• Dinex lists 4326867 and 5297478 as OE cross-reference numbers for a specific NOx sensor variant.

⚠️ Important: Different suffix variations (5WK96754 vs. 5WK96754B vs. 5WK96754C) may indicate minor production revisions or calibration differences. The suffix variants are generally interchangeable, with later suffixes (C) offering potential calibration improvements. Match the full alphanumeric string on your original sensor whenever possible. Do not rely solely on partial number matches. All cross-reference numbers are for identification purposes only — the underlying Continental reference number is the most reliable way to ensure correct functionality. Any mention of OEM names or product numbers is intended for identification purposes only.

The 5WK96754B NOx sensor is designed for 24V heavy-duty commercial vehicle electrical systems and is primarily used with Cummins diesel engines across a wide range of applications — from medium-duty trucks to high-horsepower industrial engines and generator sets. Application coverage spans EPA 2010, Euro V, China V/VI, and equivalent emission standards. Compatible engine management systems include CM2150, CM2350, and CM2450 platforms.

This sensor is most closely associated with Cummins diesel engines in heavy-duty truck, industrial, off-highway, bus, and power generation applications. It is a critical component for SCR aftertreatment systems on Cummins-powered equipment and is specifically designed to meet the rigorous emissions standards for on-highway and off-highway applications.

Placement Note: The 5WK96754B is used as both an upstream (inlet) and downstream (outlet) sensor depending on the engine configuration. For many ISB, ISL, and L9 applications, it functions as an inlet (pre-SCR) sensor. For X15 and high-horsepower QSK applications, it can be used in either position. Always verify the position of your original sensor (pre-SCR or post-SCR) before ordering, as your vehicle may use two sensors and each may require a different part number. The sensor can be mounted downstream of the NOx trap or upstream or downstream of the SCR catalyst.

Source: Comprehensive compatibility list from supplier documentation confirms fitment for all above engine codes.

The 5WK96754B NOx sensor is widely used in commercial vehicles and industrial equipment powered by Cummins diesel engines, including but not limited to:

The 5WK96754B is designed for vehicles and equipment meeting:

• EPA 2010 (EPA10) — North American heavy-duty on-highway emissions standards

• Euro V — European emissions standards

• China V / China VI — Asian market requirements

• Tier 4 Final — Off-highway and industrial equipment standards

• Equivalent standards for on-road and off-road applications globally

The sensor meets EPA and EU emissions standards, ensuring legal operation across regulated markets worldwide.

Due to the diversity of heavy-duty applications and engine management systems, physical fitment alone does not guarantee proper function. To confirm compatibility:

1. Check your original sensor label — Match the full part number 5WK96754B or confirmed cross-references (4326867, 4326867RX, A045S161, A2C95994000-01, 5WK96754C)

2. Verify voltage — The 5WK96754B is a 24V sensor; confirm your vehicle or equipment electrical system is 24V

3. Count connector pins — Gray square 4-pin sealed connector

4. Measure cable length — Approximately 890 mm; verify against original

5. Confirm thread size — M20 x 1.5

6. Identify engine platform — Confirm compatibility with specific engine code and management system (CM2150, CM2350, or CM2450)

7. Verify placement position — Confirm whether the failed sensor is in the upstream (pre-SCR) or downstream (post-SCR) position

8. Check OE numbers carefully — OEM part numbers are stamped on the back of the old unit. If in doubt about compatibility, refer to your original sensor's part number before purchasing

⚠️ Important note: Compatibility extends beyond physical fitment. The sensor must match the ECU's CAN communication protocol. Different engine management systems may use different calibration parameters even when the physical sensor appears identical. Always reference your original sensor's part number or consult vehicle-specific documentation before purchasing. For high-horsepower applications (QSK19–QSK95), verify compatibility with your specific engine serial number range as internal calibration variations may exist.

A degraded or failed 5WK96754B NOx sensor will typically trigger one or more of the following symptoms. Early recognition can prevent secondary damage to the SCR catalyst, DEF injector, Diesel Exhaust Fluid system, or Diesel Particulate Filter. NOx sensor failures are among the most common emissions system problems in modern diesel engines, and when they fail, the consequences can be immediate — check engine lights, power derates, and potential limp mode conditions that can affect vehicle uptime.

The most common first indicator is the illumination of the check engine light on your dashboard. The ECU detects abnormal, missing, or out-of-range NOx data and triggers a fault code. A faulty NOx sensor often illuminates the vehicle's check engine light.

If you have performed an on-board computer scan and your vehicle is showing any of the following error codes, it typically indicates a NOx sensor failure or related SCR system malfunction.

The rationality check for this sensor consists of sensor stuck low and stuck high checks performed whenever the engine operates under highly transient conditions. A fault condition is reached whenever the NOx sensor values are below or above a fault limit. Faulty internal start-up behavior of the NOx sensor can cause the sensor to be evaluated as "not reliable." Too long a duration of unreliable sensor signal quality is considered an error, and the OBD monitor is designed to detect bad sensor quality. The function monitors the time from enable command sent (sensor allowed to heat itself) to the time when the sensor reports full readiness; if the time is too long, the sensor does not fulfill the requirements.

P229E Code Notes: This code is particularly common for the downstream NOx sensor (System Out NOx, NOX B). It may indicate either a sensor failure or a problem with the exhaust gas sampling chamber. Activation of NOx sensors in an environment with water present (condensation in the exhaust system) risks the sensor elements cracking.

When NOx readings become inconsistent or implausible, the ECU reacts to protect emissions systems by limiting torque and engine speed. Commercial vehicles may experience speed limitation (progressive derate — from warning lights to 5 mph speed limits) or restricted RPM until the issue is resolved. This is a protective measure to prevent emissions compliance violations. Failed sensors can trigger limp mode, DEF warnings, power restriction countdowns, or, in severe cases, prevent engine restart until the fault is repaired.

A malfunctioning NOx sensor sends inaccurate data to the ECU, which in turn adjusts the air-fuel mixture incorrectly. This imbalance often causes the engine to inject more fuel than necessary, leading to increased fuel consumption and higher operating costs. This symptom may develop gradually and often goes unnoticed until combined with other warning signs.

A faulty NOx sensor disrupts the ECU and SCR, triggering fault codes and leading to incorrect DEF dosing. False high NOx readings cause the SCR to over-dose DEF, resulting in rapid DEF depletion and potential crystallized injector. A buildup of DEF deposits can physically block the injector nozzle, requiring professional cleaning or replacement. This is one of the most costly indirect symptoms of a failing NOx sensor, as excessive DEF consumption not only increases operating costs but can also lead to injector clogging and further system damage.

Since the NOx sensor directly impacts your vehicle's emissions, a failure can cause your vehicle to exceed acceptable limits, resulting in a failed test. Failing to maintain a healthy NOx sensor can result in non-compliance, potentially leading to fines and penalties for commercial fleets.

A malfunctioning NOx sensor can disrupt the SCR process, leading to improper DEF dosing. This may produce a strong ammonia or sulfur smell from the exhaust, indicating that the emissions control system is not functioning correctly and excess NH₃ (ammonia) is being released.

If the internal heater fails (open circuit), the sensor never reaches operating temperature, and DTCs set immediately after cold start. The heater circuit is critical for bringing the sensing element to operational temperature quickly after engine startup, especially in cold ambient conditions. Heater resistance should typically measure between 3-15 Ω at 20°C; an open circuit or short indicates internal failure. Heater circuit performance DTCs (such as P22A7 for Bank 1 Sensor 2) indicate heater-related failures.

When the NOx sensor is unable to maintain a reliable output, its signal quality will be set to "not reliable." This can be the case during fast transients and fast variations in NOx sensor measurement value. The OBD monitor is designed to detect bad sensor quality. This condition can be caused by:

• Soot contamination — Most common cause, leads to delamination of the sensing element

• Water ingress — Moisture in the connector due to failed sealing (particularly problematic in high-pressure wash environments)

• Cable damage — Chafing against chassis components or heat damage

• Exhaust system contamination — Engine oil consumption or poor fuel quality damaging the sensing element

Before replacing the 5WK96754B, perform these basic checks:

1. Visual inspection — Look for damaged cable insulation, chafing against chassis components, bent pins, or a melted/cracked connector. Check for water ingress, corrosion, soot buildup, oil contamination, or signs of melting at the connector. Common causes of failure include dust buildup on the sensors, water ingress to the ECU, and/or damaged cables.

2. Check DTC status — Using a diagnostic scan tool (OBD-II / SAE J1939 compatible), verify which codes are present and whether they are active or confirmed. If a code is Inactive but the Confirmed DTC value is True under detailed status information, the sensor is likely damaged and requires replacement.

3. Heater resistance test — Measure between heater positive and heater ground pins using a multimeter. An open circuit or short indicates internal failure.

4. Voltage supply — With key on and engine off, verify 24V power at the sensor connector (do NOT apply 12V). Check CAN High and CAN Low lines for proper termination (approximately 60 Ω) and absence of short circuits.

5. Live data review — Observe NOx readings with key on, engine off; it should read ambient air values (0-30 ppm). A fixed reading of 0 ppm or pegged at maximum without change points strongly suggests a faulty sensor. The NOx sensor transmits the NOx value in the exhaust gas to the ECU in real time after normal operation; lack of signal variation indicates sensor failure.

Critical Diagnostic Note: Do not replace any NOx sensors unless the troubleshooting shows an actual failure with it. This is rare. Contamination from oil consumption, fuel quality issues, or DEF system malfunctions often destroys replacement sensors — diagnose the root cause before replacement to avoid repeat failures. A recurring NOx sensor code may also be caused by an exhaust leak upstream of the sensor, poor DEF quality, a failed DEF injector, or a contaminated SCR catalyst. Perform a thorough system diagnosis before sensor replacement to avoid repeat failures. For high-horsepower QSK engines, also inspect the aftertreatment system for mechanical damage or DEF injector nozzle scaling before condemning the NOx sensor.

Purchasing the correct 5WK96754B NOx sensor and installing it properly is essential for reliable SCR performance and avoiding costly mistakes. Commercial vehicle operators and industrial equipment owners should pay special attention to voltage compatibility, correct identification of part numbers, placement position (upstream vs. downstream), and installation procedures.

• Match the full printed number on your original sensor — 5WK96754B or confirmed cross-references (4326867, 4326867RX, A045S161, A2C95994000-01, 2897314)

• Check for suffix variations — Different suffixes (5WK96754 vs. 5WK96754B vs. 5WK96754C) may indicate minor production revisions or calibration differences. The 5WK96754C variant may have improved software calibration and is generally backward compatible

• Voltage verification is non-negotiable — This is a 24V sensor. Installing a 24V sensor on a 12V system will result in the sensor never reaching proper operating temperature, leading to persistent DTCs. Installing a 12V sensor on a 24V system will cause immediate heater and electronics damage. Many other 5WK96xxx series sensors are 12V, so check carefully

• Avoid "universal fit" listings — This is a specific digital device; generic sensors claiming to fit "all diesels" are unlikely to communicate correctly with your ECU

• All cross-reference numbers are for identification purposes only — The underlying Continental reference number is the most reliable way to ensure correct functionality. Any mention of OEM names or product numbers is intended for identification purposes only. If in doubt about compatibility, refer to your original sensor's part number before purchasing

• Reputable supplier — Choose a supplier with documented quality control (IATF16949, TS16949, or ISO14001 certification) and a minimum 12-month warranty. Many premium suppliers offer 12-month, unlimited mileage coverage

• Avoid used or "remanufactured" — NOx sensors degrade internally from heat and contamination. Used sensors almost always fail prematurely. Look for 100% new products. The ceramic sensor chip is extremely sensitive to thermal cycling and contamination; a used sensor cannot be reliably restored to factory-new condition

• Price guideline — Authentic quality replacements typically range from approximately $80 to $200 for aftermarket options, with OEM-referenced parts commanding $126–$260. Suspiciously low prices (below $60) may indicate counterfeit or defective products

• Packaging — New sensors should be shipped in protective packaging with a protective cap over the ceramic tip. Single product box containing one sensor. Units should be shipped in anti-static, moisture-proof packaging

• Third-party testing — Look for sensors that have been 100% tested before delivery and come from suppliers with dust-free manufacturing facilities

• After-sales service — Some suppliers offer one-for-one compensation in case of manufacturing defects

• Quality certifications — Premium manufacturers operate under IATF16949 and ISO14001 system certifications, with 80% automation equipment and multiple test processes ensuring tracing code coverage for each product

• Do not touch the ceramic sensing tip — Skin oils cause thermal shock cracking during the first heat-up cycle, leading to immediate sensor failure or significantly reduced service life

• Inspect cable routing — Ensure the new cable follows the original path, using existing clips and standoffs. Avoid sharp bends or contact with moving parts. Do not route cables within 6 inches (150 mm) of turbocharger outlet or unprotected hot exhaust surfaces. The maximum allowable cable rotation angle after tightening is 180°

• Remove protective cap only when ready — Keep the sensor clean by removing the protective cap immediately before installation. Do not allow any dirt to contaminate the lubricated threads. If anti-wear agent is present on the threads from the manufacturer, do not wipe it clean

• Clean the bung threads — Use a thread chaser (M20 x 1.5) to remove carbon buildup and rust before installation. Never use power tools on the bung threads

• Inspect electrical connections — Check the vehicle-side connector for cleanliness, corrosion, and sealing integrity before installing the new sensor. If water or corrosion is present, replace the mating connector (IP69 sealing class required for on-highway and off-highway heavy-duty applications)

• Use clean, dry tools — Do not install the sensor if mechanical damage is found on the new unit. Always use clean, dry tools for installation

Follow this sequence for proper installation:

1. Safety First — Disconnect the vehicle's battery to prevent electrical hazards. Allow the exhaust system to cool before removal. Wear heat-resistant gloves and eye protection

2. Remove the old sensor — Carefully remove the faulty sensor from the exhaust bung. Remove dirt and rust from the assembly points

3. Secure the ECU unit — Use screws to mount the sensor's electronic control unit to the vehicle. Determine the appropriate torque based on screw type (maximum permissible torque less than 60 N/mm² as specified by the installation table)

4. Inspect the vehicle connector — Ensure the mating connector is dry, clean, and free from corrosion. If water ingress is found, investigate the sealing condition before installing the new sensor

5. Remove protective cap — Immediately before installation, remove the protective cover from the sensor probe. Do not allow any dirt to contaminate the lubricated threads. Do not wipe anti-wear agent from the thread surface

6. Install the probe — Insert the sensor probe into the exhaust bung. Hand-tighten the hexagon nut while holding the sensor tip bottom section, contacting the metal retaining clip, to prevent cable twisting and bending

7. Torque properly — CRITICAL: Follow OEM torque specifications. Use a standard torque wrench to tighten the hexagon nut. Typical torque for M20 x 1.5 threads: 40–60 Nm (50 Nm ± 10 Nm) . Torque specifications are critical as over-tightening cracks exhaust bungs while under-tightening causes leaks. After tightening, the maximum allowable cable rotation angle is 180°

8. Connect the harness — Connect the mating connector to the sensor. Ensure the connector interior is clean and dry. To prevent reverse connection, both plug and socket feature connection indexing marks. Lock the connector securely in place

9. Secure the cable — Fix the cable on the vehicle using supplied or existing brackets and connecting clamps. Use original routing clips and standoffs to secure the harness away from heat sources and moving parts

10. Reconnect battery — Restore power after installation is complete

A new NOx sensor will NOT function correctly until the ECU learns its baseline values and performs a plausibility check. Many returns are caused by skipped adaptation, not a defective part. The sensor must be replaced and reprogrammed in accordance with the vehicle manufacturer's specifications. Various error messages may occur if the sensor is not programmed accordingly.

Why adaptation is necessary: Engine Control Units continuously learn and adapt to sensor degradation over time. Installing a fresh component without resetting these learned values leaves your ECU operating on outdated, skewed data. The stored NOx values from the old sensor must be deleted before the new sensor can function properly. Without proper adaptation, the system may still show fault codes even with a brand new sensor.

What DOES NOT work: Attempting to clear deep-level adaptation memory by disconnecting the battery is ineffective on modern emissions systems and often triggers secondary Battery Management System faults. Torque and aftermarket "DEF defeat" devices are illegal and will permanently damage your ECU and aftertreatment system.

What DOES work:

1. Install the sensor following the sequence above

2. Connect a professional diagnostic scan tool capable of commercial vehicle diagnostics (SAE J1939 / OBD-II compatible). For Cummins applications, INSITE or Premium Tech Tool is recommended

3. Clear all existing DTCs — Use the diagnostic tool to clear all existing fault codes

4. Perform "NOx sensor reset / adaptation / teach-in" — This function is typically found under "Special functions," "SCR system," or "Aftertreatment service" in diagnostic software. Navigate to the SCR/Emissions service menu. Execute the command to reset learned values for the replaced component. The ECU may command a specific warm-up sequence (often including holding the engine at elevated RPM for several minutes)

5. Reset SCR learned values (if available) — This clears previously stored efficiency values from the old sensor

6. If required, perform sensor programming — Some vehicle platforms require specific NOx sensor programming. The sensor must be replaced and reprogrammed in accordance with the vehicle manufacturer's specifications

7. Drive cycle — Complete a 15–20 minute mixed driving cycle at operating temperature with varying engine loads (both city and highway conditions)

8. Verify readiness — After the drive cycle, check for any returning DTCs. Monitor live NOx data; it should fluctuate logically (higher readings under heavy load, lower readings at idle). If codes remain (P2200, P229E), either adaptation was not performed or there is another underlying root cause in the aftertreatment system

⚠️ Without proper adaptation, you may still see DTCs (e.g., P2200, P229E) even with a brand new sensor. Many returns are caused by skipped adaptation, not a defective part. Error cleaning may be required after fitting a new NOx sensor, but just once after installation.

• 24V system confirmation: The 5WK96754B is a 24V sensor. Unlike many other 5WK96xxx series NOx sensors (particularly those with "A" or no suffix) that are 12V, this sensor is designed for 24V heavy-duty applications. Always verify your vehicle's electrical system voltage before purchase. Installing a 24V sensor on a 12V system will result in the sensor never reaching proper operating temperature, leading to persistent DTCs. Installing a 12V sensor on a 24V system will cause immediate heater or electronics damage

• Placement position verification: The 5WK96754B can be used in both upstream (inlet / pre-SCR) and downstream (outlet / post-SCR) positions depending on the engine configuration. Verify which position your original sensor occupies. For ISB, ISL, and L9 applications, it is commonly an inlet sensor. For X15, it can be used in either position. The downstream sensor may also be referred to as System Out NOx sensor, NOX B, Bank 1 Sensor 2, or Post Catalytic Reduction NOx sensor

• Wiring harness condition: Commercial vehicles and industrial equipment operate in extremely harsh environments (vibration, heat, moisture, road salt, mud). Inspect the full harness length for chafing, corrosion at connectors, and damaged insulation before condemning the sensor. For mining applications, also inspect for physical impact damage

• SCR system health: A recurring NOx sensor code may indicate a failed SCR catalyst, DEF quality issues, or a clogged DEF injector. These should be diagnosed before replacing the sensor a second time. For high-horsepower QSK engines, also inspect the aftertreatment system for mechanical damage or DEF injector nozzle scaling

• Multiple sensor positions: Some platforms use two NOx sensors (upstream and downstream). The 5WK96754B may be used for either position depending on the application. Verify which position requires replacement on your specific vehicle. When repairing the SCR system, it is often recommended to replace both sensors to ensure they are working in sync

• ECU software updates: In some cases, a recurring NOx sensor issue may be addressed by an ECU software update rather than repeated sensor replacement. For Continental CES systems, check for available calibration updates before replacing the sensor

• Root cause investigation: Contamination from oil consumption, fuel quality issues, or DEF system malfunctions often destroys replacement sensors. Always diagnose the root cause before replacement to avoid repeat failures. Soot contamination is the most common reason for NOx sensor failure, but moisture can also damage the sensors. For high-horsepower QSK engines, also inspect engine oil consumption rates — excessive oil carryover will rapidly destroy any NOx sensor

• Emergency service: For breakdown or urgent fleet maintenance, some suppliers offer emergency-service channels for critical breakdown orders. Highlight "URGENT" in your inquiry to prioritize production and arrange express shipping (DHL, FedEx, UPS)

• In regions with mandatory emissions testing (EU, California, China, Australia, Brazil), a non-functioning NOx sensor will cause the MIL to illuminate, resulting in automatic inspection failure

• It is illegal to defeat, delete, or simulate the NOx sensor signal in any on-road vehicle. Always replace with a fully functional sensor. Tampering with the SCR system (including disabling NOx sensor via software) is illegal and void warranties

• Commercial fleets subject to emissions auditing must maintain properly functioning SCR systems, including accurate NOx sensing

• The sensor is designed to optimize emissions and fuel economy to meet national and regional emission standards

• The sensor meets EPA and EU emissions standards, ensuring legal operation across regulated markets

• Progressive derate system: Unaddressed NOx sensor faults trigger escalating restrictions, from warning lights to 5 mph speed limits and no-restart conditions. Address NOx faults promptly to avoid catalyst degradation and minimize vehicle downtime

• Before purchasing, confirm the supplier offers a return or exchange for compatibility errors, preferably within 30–90 days of receipt

• Keep your original sensor until the new one is confirmed working — it serves as the ultimate reference for part number and fitment

• Request a data sheet or installation guide that includes pinout and adaptation steps if available

• Most reputable suppliers offer a 6–12 month warranty against manufacturing defects. Some offer one-year, unlimited mileage coverage

• Some suppliers offer one-for-one compensation in case of manufacturing defects

• For bulk orders, white-label and custom packaging services (including barcoding, fleet labeling) may be available

The NOx Sensor 5WK96754B is a critical emissions aftertreatment component for 24V heavy-duty and industrial diesel engines. As a Continental-controlled emission system sensor, it offers advanced HTCC ceramic sensing technology for improved measurement accuracy and durability across a broad range of applications — from on-highway trucks to mining equipment and generator sets.

Key cross-references: 5WK96754C, 4326867, 4326867RX, A045S161, A2C95994000-01, 2897314, 5297478, 5WK96754

Key technical specifications:

• Operating voltage: 24V DC (critical distinction — NOT 12V)

• NOx measuring range: 0–2500 ppm

• O₂ measuring range: 0%–21%

• NOx accuracy: 0–100ppm: ±10ppm; 100–500ppm: ±10%; 500–1500ppm: ±15%; 1500–2500ppm: ±25%

• O₂ accuracy: 0%–5%: ±0.2%; 5%–21%: ±4%

• Response time: t10↔90% λlin < 3500 ms; t10↔90% NOx < 3500 ms

• Light-off time: < 100 seconds (from dew point to measurement state)

• Design life: 6,000 operating hours or 350,000 km

• Connector: Gray square 4-pin sealed

• Thread: M20 x 1.5

• Cable length: 890 mm

• Weight: Approximately 0.6 kg

• Torque specification: 40–60 Nm (50 Nm ± 10 Nm)

• Emission standard: EPA10, Euro V, China V/VI

• Certifications: IATF16949, CE, E-mark, TS16949, ISO14001

Compatible engine platforms (verified):

• Cummins B4.5 (B4.5 CM2350 B129B/B147B, ISB4.5 CM2350 B104)

• Cummins B6.7 (B6.7 CM2350 B121B, B6.7 CM2450 B155B, ISB6.7 CM2350 B101)

• Cummins ISL / L9 (ISL9 CM2350 L101/L111, L9 CM2350 L116B/L119B/L123B, L9 CM2450 L126B)

• Cummins QSB3.3 CM2150

• Cummins QSF3.8 CM2350 F107/F118

• Cummins QSK19–95 (multiple CM2350 configurations)

• Cummins QST30 CM2350 T101

• Cummins QSX15 CM2350 X105

• Cummins X15 (X15 CM2350 X130C/X132C/X139C)

• Compatible management systems: CM2150, CM2350, CM2450

Equipment and vehicle applications (representative):

• Kenworth: T660, T680, T700, T800, T880, W900, C500

• Freightliner: Cascadia, Coronado, Columbia, 114SD, M2, ProStar, XC Raised Rail

• Peterbilt: 365, 367, 384, 386, 388, 389, 567

• Dongfeng: Chinese domestic trucks with Cummins B4.5/B6.7

• Blue Bird: All American FE/RE, Vision School Bus

• International: ProStar, HX, LT series

• Mining equipment: QSK-powered haul trucks

• Marine: QSK-powered propulsion systems

• Stationary generator sets: QST and QSK-powered power generation

Installation requirements:

• Do NOT apply anti-seize to threads (unless pre-applied by manufacturer)

• Do NOT wipe anti-wear agent from threads

• Do NOT touch ceramic sensing element

• Confirm 24V system voltage — DO NOT install on 12V vehicles

• Professional installation and mandatory ECU adaptation required after replacement

• Perform torque to 40–60 Nm (50 Nm ± 10 Nm)

• Use M20 x 1.5 thread chaser to clean bung threads

CRITICAL NOTE – VOLTAGE COMPATIBILITY: The 5WK96754B operates on 24V DC. This distinguishes it from many other NOx sensors in the 5WK96xxx series that are designed for 12V commercial vehicle applications. Always verify your vehicle's electrical system voltage (12V or 24V) before purchase. Installing this 24V sensor on a 12V system will result in the sensor never reaching proper operating temperature, leading to persistent DTCs. Installing a 12V sensor on a 24V system will cause immediate heater or electronics damage.

CRITICAL NOTE – ECU ADAPTATION IS MANDATORY: A physical NOx sensor replacement must be paired with an ECU adaptation or reset to clear permanent fault codes and restore SCR efficiency. Disconnecting the battery will NOT work. Without proper adaptation, you will still see DTCs (P2200, P229E) even with a brand new sensor. Error cleaning may be required after fitting a new NOx sensor, but just once after installation.

CRITICAL NOTE – DIAGNOSE BEFORE REPLACEMENT: Do not replace any NOx sensors unless the troubleshooting shows an actual failure with it. Contamination from oil consumption, fuel quality issues, or DEF system malfunctions often destroys replacement sensors. Perform a thorough system diagnosis including DEF quality check, exhaust leak inspection, oil consumption measurement, and confirmation of active/confirmed DTC status before sensor replacement to avoid repeat failures.

Failure symptoms summary:

• Check engine light illumination

• Diagnostic codes: P2200, P229E, P229F, U029E, P20EE, P220F

• Reduced engine power / limp mode with progressive derate

• Poor fuel economy / increased fuel consumption

• Increased DEF (AdBlue) consumption

• Failed emissions test

• Unusual ammonia/sulfur odor from exhaust

• Heater circuit faults

• Signal reliability issues and OBD monitor faults