OEM HTCC Car NOx Sensor Diesel 2872946 0–2500ppm 5WK96741

The 5WK96741 is a planar dual-cell limiting current type nitrogen oxide (NOx) sensor designed for 12V medium-duty and 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. 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 a HTCC (High-Temperature Co-fired Ceramic) sensing element and an integrated electronic control unit, forming a single unit installed directly in the exhaust gas system. It is designed to withstand harsh operating conditions while maintaining high measurement accuracy.

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.

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

• Upstream (inlet / pre-SCR) – installed before the SCR catalyst, providing real-time feedback to precisely meter Diesel Exhaust Fluid (DEF) injection

• Downstream (outlet / post-SCR) – installed after the SCR catalyst, used mainly to confirm that legislated emissions limits have not been exceeded

The 5WK96741 is typically used as an Outlet (System Outlet / Downstream) NOx sensor in most applications, installed after the SCR catalyst to verify emissions compliance.

Important: The 5WK96741 operates on a 12V system voltage. Always verify your vehicle‘s electrical system voltage before purchase. Do not install on 24V systems — this will cause immediate and permanent damage to the sensor electronics. The 5WK96741 serves as the base reference for this sensor family, with suffix variants (5WK96741B) also available. Always match the full alphanumeric string on your original sensor.

The following part numbers are directly interchangeable with 5WK96741. 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, thread size, and cable length before purchasing.

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

• The 5WK96741 sensor family is listed as direct replacement for OEM numbers 4326874RX, 4326874, 28729846, 904-6013, 2006244, 2872946, A045S171, and 4326768.

• Dorman HD Solutions lists 904-6013 as an Output Sensor for Various Cummins ISX Engines (2013–2018), with OE cross-references including 4326874, 4326874RX, and 28729846.

• The sensor also cross-references to 2872946, 5WK96741B, 4326874, 4326874RX for 2013-2020 Cummins ISX 11.9L and 15L applications.

• DPFXFIT lists SENN-0023XF as an aftermarket replacement for select Cummins engines, built to OEM specifications with accurate NOx readings.

• All cross-reference numbers are for identification purposes only. The underlying Continental reference number (5WK96741) is the most reliable way to ensure correct functionality.

Important: Different suffix variations (5WK96741 vs. 5WK96741B) may indicate minor production revisions or calibration differences. Match the full alphanumeric string on your original sensor whenever possible. Do not rely solely on partial number matches. The sensor is not for the downstream application (Dorman 904-6013 listed as Output Sensor for 2018-13 ISX Engines) — always verify your specific application before purchase.

The 5WK96741 NOx sensor is designed for 12V commercial vehicle electrical systems and is primarily used with Cummins diesel engines in heavy-duty and medium-duty commercial vehicle applications. Application coverage spans EPA 2010, Euro V, China V/VI compliant vehicles, with primary usage in model years approximately 2013–2020.

This sensor is most closely associated with Cummins diesel engines in heavy-duty truck and commercial vehicle applications. It is specifically identified as an Outlet / Output NOx Sensor used after the SCR catalyst to monitor treated exhaust gases. The sensor is commonly used with Cummins engines fitted with SCR aftertreatment systems meeting EPA 2010 emission standards.

From multiple supplier sources, the sensor is specifically designed for Cummins ISB6.7, ISX11, and ISX15 engines, with a confirmed fitment on Cummins ISB6.7 and ISX15 diesel exhaust systems for nitrogen oxide measurement and SCR feedback.

The 5WK96741 NOx sensor is widely used in heavy-duty trucks powered by Cummins diesel engines. Verified vehicle compatibility includes:

Multiple sources confirm compatibility with model years 2013–2018 for these truck platforms. Some listings extend compatibility through 2020 for certain applications.

The sensor has been verified for specific 2019 vehicle configurations as documented in compatibility listings:

The 5WK96741 is specifically identified as an Outlet / Output NOx Sensor (System Outlet / Downstream position) in most applications. The outlet sensor is installed after the SCR catalyst and is used to confirm that treated exhaust complies with emissions regulations.

When replacing this sensor, verify the position of your failed sensor:

• Upstream (inlet / pre-SCR) – mounted before the DPF or SCR catalyst

• Downstream (outlet / post-SCR) – mounted after the SCR catalyst

Multiple sources confirm the 5WK96741 family is specifically for Outlet / Output position applications.

The 5WK96741 is designed for vehicles meeting:

• EPA 2010 (EPA10) – North American heavy-duty emissions standards (primary application)

• Euro V – European emissions standards

• China V / China VI – Asian market requirements

• Equivalent Tier standards for heavy-duty on-road applications

Due to the diversity of commercial vehicle configurations, physical fitment alone does not guarantee proper function. To confirm compatibility:

1. Check your original sensor label – Match the full part number 5WK96741 or confirmed cross-references (4326874, 2872946, 904-6013, 4326874RX, etc.)

2. Verify voltage – The 5WK96741 is a 12V sensor; confirm your vehicle electrical system is 12V

3. Count connector pins – Black square 4-pin sealed connector

4. Confirm thread size – M20 x 1.5

5. Check engine platform – Confirm compatibility with Cummins ISX (11.9L / 15L) or ISB6.7 engines

6. Verify placement position – Typically Outlet / Downstream (post-SCR) position

7. Confirm model year – Primarily 2013–2020 vehicles

8. Check the original OE number – OEM part numbers are located 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. Always reference your original sensor‘s part number or consult vehicle-specific documentation before purchasing.

A degraded or failed 5WK96741 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 rank 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. Soot contamination and delamination often leads to improper sensor readings, resulting in the check engine light or the vehicle going into limp mode.

If you have performed an on-board computer scan and your vehicle is showing any of the following error codes, it typically means the NOx sensor has failed.

Technical documents confirm that P2200 or P229E indicates the ECM has received a NOx sensor module serial data message indicating an open signal circuit for greater than 3 seconds. P2202 indicates the ECM has received a NOx sensor module serial data message indicating a NOx concentration is less than -90 ppm for greater than 3 seconds.

The following DTCs all pertain to the Downstream NOx sensor located in the outlet side of the SCR catalyst (also known as System Out NOx, NOX B, Bank 1 Sensor 2): P229E, P225E, P225F, P22A7, U059F, P1C56, P22FC, U029E, P229F.

For Upstream NOx sensor (located in exhaust pipe towards the inlet of DPF, also known as Engine Out NOx, NOX A, Bank 1 Sensor 1), associated codes include: P2202, P1C55, P2209, P220A, P2201, U029D.

The rationality check for this sensor consists of sensor stuck low and stuck high checks performed whenever the engine operates under highly transient conditions. 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.

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 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 prevent restart.

Unaddressed NOx sensor faults trigger escalating restrictions, from warning lights to 5 mph speed limits and no-restart conditions. These progressive derate systems are designed to force prompt repair of emissions-related faults.

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. Poor fuel economy margins are a common symptom of a failing NOx sensor.

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. This is one of the most costly indirect symptoms of a failing NOx sensor. The sensor’s exhaust gas sampling chamber can be affected, causing improper measurement and subsequent over-dosing.

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. Compliance with state-mandated emissions inspections requires properly functioning NOx sensors.

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. 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. Activating NOx sensors in an environment with water present risks the sensor elements cracking.

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 circuit performance DTCs (such as P22A7 for Bank 1 Sensor 2) indicate heater-related failures.

Before replacing the 5WK96741, perform these basic checks:

1. Visual inspection – Look for damaged cable insulation, chafing against chassis components, bent pins, or a melted/cracked connector. Soot contamination and delamination are common causes of improper sensor readings.

2. Check DTC status – Using a diagnostic scan tool, verify which codes are present and whether they are active or confirmed. If a code is Inactive but the Confirmed DTC value is True, 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 12V power at the sensor connector (do NOT apply 24V).

5. Live data review – Observe NOx readings; a fixed reading of 0 ppm or pegged at maximum without change points strongly suggests a faulty sensor.

6. Troubleshooting procedures – Do not replace any NOx sensors unless the troubleshooting shows an actual failure with it. This is rare. The troubleshooting should include verifying that the code is either Active or if Inactive that the Confirmed DTC value is True.

Note: 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.

Purchasing the correct 5WK96741 NOx sensor and installing it properly is essential for reliable SCR performance and avoiding costly mistakes. Commercial vehicle operators should pay special attention to voltage compatibility, correct identification of part numbers, placement position, and installation procedures.

• Match the full printed number on your original sensor – 5WK96741 or confirmed cross-references (4326874, 4326874RX, 2872946, 2872946RX, 28729846, 904-6013, 9046013, 2006244, A045S171)

• Check for suffix variations – Different suffixes (5WK96741 vs. 5WK96741B) may indicate minor production revisions or calibration differences. Do not rely solely on partial number matches. The 5WK96741 serves as the base reference; suffix B is also commonly available and interchangeable in most applications

• 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

• Check OE numbers carefully – OEM part numbers are located on the back of the old unit. If in doubt about compatibility, refer to your original sensor‘s part number before purchasing

• All cross-reference numbers are for identification purposes only – The underlying Continental reference number is the best way to ensure correct functionality. OEM names or numbers are for identification purposes only

• Refer to the part number on the back of the old unit – If in doubt, consult a specialist before purchasing

• Reputable supplier – Choose a supplier with documented quality control (IATF 16949, ISO 14001, or TS16949 certification) and a minimum 12-month warranty

• Avoid used or “remanufactured” – NOx sensors degrade internally from heat and contamination. Used sensors almost always fail prematurely. Look for 100% new products

• Price guideline – Authentic quality replacements typically range from approximately $90 to $275. Suspiciously low prices 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

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

• Certification – Look for sensors with TS16949, CE, CCC, ISO14001, IATF16949 certifications. Gaoxin Green Technology offers sensors with ISO14001 and IATF16949 system certification

• Direct OE replacement – Aftermarket products should have the same fit and performance as original equipment without the high price. OEM names or numbers are for identification purposes only

• Do not touch the ceramic sensing tip – Skin oils cause thermal shock cracking during the first heat-up cycle

• Inspect cable routing – Ensure the new cable follows the original path, using existing clips and standoffs. Avoid sharp bends or contact with moving parts

• 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 threads

• Clean the bung threads – Use a thread chaser (M20 x 1.5) to remove carbon buildup and rust before installation

• Inspect electrical connections – Check the vehicle-side connector for cleanliness, corrosion, and sealing integrity before installing the new sensor

• Verify cable length – Cable length reference is 920 mm; ensure replacement matches or consult your specific vehicle requirements

• Look for robust design – Premium sensors are meticulously designed to resist soot buildup, protect against ECU water ingress, and safeguard against cable damage, ensuring long-lasting, consistent readings even in demanding conditions

Follow this sequence for proper installation:

1. Prepare the mounting location – 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

3. Remove dirt and rust – Before installing the new sensor, remove dirt and rust from the assembly points

4. Inspect the vehicle connector – Ensure the mating connector is dry, clean, and free from corrosion

5. Remove protective cap – Immediately before installation, remove the protective cover from the sensor probe

6. Install the probe – Screw in the sensor and tighten to the torque specified by the manufacturer. Insert the sensor probe into the exhaust bung. Hand-tighten while holding the sensor body to prevent cable twisting

7. Torque properly – Critical: Follow OEM torque specifications. Typical torque for M20 x 1.5 threads: 40–55 Nm. Torque specifications are critical as over-tightening cracks exhaust bungs while under-tightening causes leaks

8. Fix the cable – Fix the cable on the vehicle using supplied or existing brackets/connecting clamps

9. Connect the harness – Connect the mating 4-pin connector to the sensor. Ensure the connector interior is clean and dry

10. Secure the cable – Use original routing clips and standoffs to secure the harness away from heat sources and moving parts

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.

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.

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)

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. Perform the scan tool NOx Sensor 1 or 2 Reset procedure after replacing the NOx sensor 1 or 2 [18†L4-L7]

5. Reset SCR learned values (if available) – Navigate to the SCR/Emissions service menu. Execute the command to reset learned values for the replaced component. Resetting adaptation values after replacing a NOx sensor allows the ECU to properly interpret the new sensor’s data

6. Drive cycle – Complete a 15–20 minute mixed driving cycle at operating temperature with varying engine loads

7. Verify readiness – After the drive cycle, check for any returning DTCs. Monitor live NOx data; it should fluctuate logically

Software Calibration 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. Various error messages may occur if the sensor is not programmed accordingly. In Premium Tech Tool, verify that either the code is Active, or if Inactive that the Confirmed DTC value is True under the detailed status information.

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.

• 12V system confirmation: Unlike many other 5WK96xxx series NOx sensors that operate on 24V, the 5WK96741 is a 12V sensor. Verify your vehicle‘s electrical system voltage before purchase. Installing a 12V sensor on a 24V system will cause immediate heater or electronics damage

• Outlet position verification: The 5WK96741 is typically used as an Outlet / Downstream (post-SCR) sensor. Verify which position (upstream vs. downstream) requires replacement on your specific vehicle. The outlet NOx sensor is located in the outlet side of the SCR Catalyst and 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 operate in harsh environments (vibration, heat, moisture, road salt). Inspect the full harness length for chafing, corrosion at connectors, and damaged insulation before condemning the sensor

• 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

• Multiple sensor positions: Some platforms use two NOx sensors (upstream and downstream). The 5WK96741 is for outlet position. The downstream sensor may also be referred to as NOX B, Lower NOx, Bank 1 Sensor 2, NOx Sensor 1/2 or Post Catalytic Reduction NOx sensor

• ECU software updates: In some cases, a recurring NOx sensor issue may be addressed by an ECU software update rather than repeated sensor replacement

• Anti-seize coating: Some aftermarket sensors come with pre-applied anti-seize coating to improve serviceability — verify manufacturer specifications before installation

• Root cause matters: Contamination from oil consumption, fuel quality issues, or DEF system malfunctions often destroys replacement sensors — diagnose before replacing to avoid repeat failures. Soot contamination and delamination are common causes of improper sensor readings

• Warranty considerations: Some manufacturers offer extended coverage for NOx sensor conditions. Contaminated exhaust gases from engine oil contamination are a common issue indicating worn out engine components; the sensor chip in this case is easily damaged and warranty becomes void

• 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

• 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

• Before purchasing, confirm the supplier offers a return or exchange for compatibility errors, preferably within 30 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. MCT Sensor offers the first NOx sensor company to offer one-year, unlimited mileage Full Coverage Insurance

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

Based on compatibility data, the 5WK96741 sensor family is primarily used for vehicles from model years approximately 2013 through 2020 for Cummins ISX 11.9L and 15L engines. Always verify your specific vehicle model year and engine platform before purchase. For newer vehicles (post-2020), always reference your original sensor‘s part number as OEM specifications may have changed.

The NOx Sensor 5WK96741 is a critical emissions aftertreatment component for 12V heavy-duty diesel commercial vehicles. Unlike many other sensors in the 5WK96xxx series which operate on 24V, the 5WK96741 is specifically designed for 12V systems and is primarily used with Cummins diesel engines (ISX 11.9L/15L, ISB6.7) in Freightliner, Kenworth, Peterbilt, Western Star, and Volvo trucks, meeting EPA 2010 and Euro V emission standards.

Key cross-references: 5WK96741B, 4326874, 4326874RX, 2872946, 2872946RX, 28729846, 904-6013, 9046013, 2006244, A045S171, 4326768, 5EL005, SENN-0023XF

Key technical specifications:

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

• NOx measuring range: 0–2500 ppm

• O₂ measuring range: 0%–21%

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

• 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 hours or 350,000 km

• Connector: Black square 4-pin sealed

• Thread: M20 x 1.5

• Cable length reference: 920 mm

• Package dimensions: 18 × 11 × 6 cm

• Weight: Approximately 0.3 – 0.6 kg

• Torque specification: 40–55 Nm

• Certifications: TS16949, CE, CCC, ISO14001, IATF16949

Compatible engine platforms:

• Cummins ISX 15L / ISX 11.9L (2013–2020)

• Cummins ISB6.7 (2013–2018)

• Cummins L6 11.9L

Vehicle applications (representative):

• Freightliner: Cascadia, Coronado, Columbia, ProStar, XC Raised Rail

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

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

• Western Star: 4900FA, 4900SA, 4900EX, 6900XD

• Volvo: VNL

• International: ProStar, HX620, LT625

Placement on vehicle: The 5WK96741 is identified as an Outlet / Downstream NOx Sensor (System Outlet / Post-SCR position), installed after the SCR catalyst to verify emissions compliance. 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.

Installation requirements:

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

• Do NOT touch ceramic sensing element

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

• Professional installation and mandatory ECU adaptation required after replacement

• Perform torque to 40–55 Nm

• Use M20 x 1.5 thread chaser to clean bung threads

• Always verify confirmed DTC status before replacement

CRITICAL NOTE – VOLTAGE COMPATIBILITY: The 5WK96741 operates on 12V DC. This distinguishes it from many other NOx sensors in the 5WK96xxx series that are designed for 24V commercial vehicle applications. Always verify your vehicle‘s electrical system voltage (12V or 24V) before purchase. Installing this 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. Perform the scan tool NOx Sensor Reset procedure after replacing the NOx sensor.

CRITICAL NOTE – DIAGNOSE BEFORE REPLACEMENT: 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. Perform a thorough system diagnosis including DEF quality check, exhaust leak inspection, 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, P225E, P225F, U029E, P20EE, P220F

• Reduced engine power / limp mode with progressive derate (warning lights to 5 mph limits)

• Poor fuel economy / increased fuel consumption

• Increased DEF (AdBlue) consumption

• Failed emissions test

• Sensor signal quality set to “not reliable”

• Heater circuit faults

Proper selection (matching the part number 5WK96741 and confirmed cross-references), confirmation of 12V system voltage, careful installation using correct torque (40–55 Nm), and mandatory ECU adaptation ensure full emissions compliance, optimal fuel economy, and reliable SCR system performance. Use this guide to confidently purchase and replace a failed 5WK96741 NOx sensor without compatibility issues or repeat failures.