Zirconium Dioxide Downstream Auto NOx Sensor 4326868 1928760 1953530 5WK96752C SNS0152D

The 5WK96752C is a planar dual-cell limiting current type nitrogen oxide (NOx) sensor designed for 24V heavy-duty diesel engine exhaust aftertreatment systems. It is an electrochemical sensor that continuously monitors the concentration of nitrogen oxides in the exhaust stream and communicates with the engine control unit (ECU) via digital communication protocols (typically SAE J1939 CAN bus). This real-time feedback enables precise control of the Selective Catalytic Reduction (SCR) system, ensuring compliance with Euro V, Euro VI, EPA 2010, and equivalent emission standards.

The sensor is a Generation 2.0 (Gen 2.0) design, offering improved accuracy over earlier sensors, faster reaction time, ability to be reflashed with updated software, and enhanced waterproofing and dust/debris accumulation resistance.

Most engines equipped with SCR aftertreatment systems utilize two NOx sensors. The upstream sensor is mounted before the exhaust-gas treatment system and provides real-time feedback for the SCR control loop to precisely meter Diesel Exhaust Fluid (DEF) injection. The downstream sensor is mounted after the SCR catalyst and is used primarily to confirm that legislated emissions limits have not been exceeded.

Important: The 5WK96752C operates on a 24V system voltage and is designed for commercial vehicle SCR applications including trucks, buses, and construction equipment. Do not install on 12V passenger car systems unless explicitly verified for dual-voltage compatibility.

• Improved accuracy over other aftermarket sensors

• Faster reaction time enabling more responsive SCR control

• Updatable software – sensor can be reflashed with the latest calibration

• Enhanced waterproofing – improved resistance to moisture ingress

• Superior dust and debris accumulation resistance for harsh operating environments

• Self-diagnostic technology – automatically compensates for minor signal drifts and environmental variations

The following part numbers are directly interchangeable with 5WK96752C. 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, cable length, and voltage rating before purchasing.

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

• 5WK96752C is listed as a direct crossover to Cummins 4326868, 4326868RX, 1928760, and 1953530

• The sensor is manufactured by Continental (OE manufacturer)

• DAF applications cross-reference include 2872779, 2897311, 1862931, 1953530

• The same sensor is listed under Dinex aftermarket reference NOX-5EL010

• Paccar cross-references include 1928760 and 1953530

⚠️ Suffix and supersession caution: Different variants in the 5WK9675x series (5WK96752C vs. 5WK96752A, etc.) 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. Always confirm fitment by OEM part number and engine configuration.

The 5WK96752C is a Gen 2.0 sensor with updatable software capability. When replacing, ensure that your vehicle’s ECU is compatible with Gen 2.0 sensor communication protocols, as earlier generation sensors may have different calibration parameters.

The 5WK96752C NOx sensor is designed for 24V commercial vehicle electrical systems and is widely used across medium-duty and heavy-duty diesel engine platforms. Application coverage spans Euro V / Euro VI / EPA 2010 compliant commercial vehicles.

This sensor is most closely associated with Cummins diesel engines in commercial vehicle applications. It is designed for use in Cummins engines fitted with SCR aftertreatment systems meeting EPA 2010 emission standards.

Based on cross-reference information and supplier listings, the 5WK96752C is compatible with the following engine platforms:

The 5WK96752C is found in a wide range of 24V commercial vehicle applications:

• Heavy-duty trucks – long-haul and regional transport (EPA 2010 / Euro VI compliance)

• Medium-duty trucks – delivery and utility vehicles

• DAF XF series – heavy-duty trucks including XF 106 models

• DAF XF 106 Euro 6 – Euro VI compliant heavy-duty trucks

• Solaris Urbino buses – public transportation buses

• Construction equipment – diesel-powered machinery with emission controls

• Industrial equipment – SCR-equipped industrial diesel machinery

The 5WK96752C is designed for vehicles meeting:

• EPA 2010 – North American heavy-duty emissions standards

• Euro V and Euro VI – European emissions standards

• China 5 and China 6 – Asian market requirements

• Equivalent Tier standards for off-road equipment

Depending on the vehicle configuration, the 5WK96752C can be mounted in either of the following positions:

• Upstream position – Before the SCR catalyst, used for real-time feedback to control DEF dosing

• Downstream position – Behind the catalytic converter, used for emissions compliance verification

The sensor operates on a 24V power supply and includes ECU programming compatibility. This makes it suitable for most heavy-duty diesel platforms manufactured after the introduction of SCR-based emissions compliance systems. The sensor is compatible with the ECU program that controls engine operation.

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 5WK96752C or cross-references (4326868, 1928760, 1953530, etc.)

2. Verify voltage – The 5WK96752C is a 24V sensor; confirm your vehicle electrical system is 24V

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

4. Confirm Gen 2.0 compatibility – Ensure your vehicle’s ECU can communicate with Gen 2.0 NOx sensors

5. Check ECU compatibility – Some platforms require software adaptation after sensor replacement

⚠️ Important note: Compatibility extends beyond physical fitment. The sensor must match the ECU’s communication protocol. Different vehicle manufacturers may use different calibration parameters even when the physical sensor appears identical. Always reference your original sensor part number or consult vehicle-specific documentation before purchasing. According to manufacturer recommendations, always check the original OE part number to ensure proper product fitment.

A degraded or failed 5WK96752C NOx sensor will typically trigger one or more of the following symptoms. Early recognition can prevent secondary damage to the SCR catalyst, DEF injector, or Diesel Particulate Filter.

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

Common codes associated with NOx sensor failure include:

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 (typically 5-20 mph or restricted RPM) until the issue is resolved. This is a protective measure to prevent emissions compliance violations and further damage to the aftertreatment system.

One of the most common failure modes for this sensor family is water ingress at the connector. When the mating connector sealing fails (e.g., sealing plug or sealing ring missing or damaged), water enters the electrical interface, causing corrosion and communication errors. Typical symptoms include:

• NOx sensor communication error with visible water and rust at the customer connector

• Intermittent sensor operation that worsens in wet conditions

• Corroded pins visible upon connector inspection

Root cause: Mating connector sealing failure. Action: Replace NOx sensor and ensure mating connector meets IP69 sealing class.

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 AdBlue depletion and potential crystallized injector.

A malfunctioning NOx sensor can cause the engine control unit to adjust the air-fuel ratio to reduce emissions, which can lead to decreased fuel efficiency. Fuel consumption can increase by 15-25% as the engine operates in a suboptimal state.

If the internal heater fails (open circuit), the sensor never reaches operating temperature, and DTCs set immediately after cold start. This condition is often confirmed by checking heater circuit resistance.

When the NOx sensor is unable to maintain a reliable output, its signal quality will be set to “not reliable.” This can occur during fast transients and fast variations in NOx sensor measurement value. The ECU monitors sensor reliability and sets a fault condition when unreliable signal duration exceeds acceptable limits.

Before replacing the 5WK96752C, perform these basic checks:

1. Visual inspection – Look for damaged cable insulation, chafing against chassis components, bent pins, or a melted/cracked connector. Examine the connector for water ingress, rust, or corrosion

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

3. Voltage supply – With key on and engine off, verify 24V power at the sensor connector

4. CAN bus integrity – Check CAN High and CAN Low lines for proper termination

5. Live data review – Using a diagnostic scan tool, observe NOx readings. A fixed reading of 0 ppm or pegged at maximum without change points strongly suggests a faulty sensor

6. Signal stuck check – The ECU performs rationality checks for sensor stuck low and stuck high during highly transient engine operating conditions

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, a contaminated SCR catalyst, or communication issues on the vehicle’s CAN network. Perform a thorough system diagnosis before sensor replacement to avoid repeat failures.

Purchasing the correct 5WK96752C NOx sensor and installing it properly is essential for reliable SCR performance and avoiding costly mistakes. Commercial vehicle operators should pay special attention to electrical and communication compatibility, particularly given the Gen 2.0 technology features.

• Match the full printed number on your original sensor – 5WK96752C or confirmed cross-references (4326868, 1928760, 1953530, etc.)

• Check Gen 2.0 compatibility – The 5WK96752C is a Gen 2.0 sensor with updatable software. Ensure your vehicle’s ECU can support this generation

• Avoid “universal fit” listings – The 5WK96752C is a specific digital device; generic sensors claiming to fit “all 24V diesels” are unlikely to communicate correctly with your ECU

• Never rely solely on partial number matches – Always compare the full part number on your original sensor with the replacement part

• Reputable supplier – Choose a supplier with documented quality control and a minimum 12-month warranty

• Avoid used or “remanufactured” – NOx sensors degrade internally from heat and contamination. Used sensors almost always fail prematurely

• Price guideline – Authentic quality replacements typically range from $150 to $300 for aftermarket options. Genuine branded replacements may command higher prices

• Certification – Look for suppliers with TS 16949 certification, indicating quality management system compliance

• Check for updatable software capability – Gen 2.0 sensors should be able to be reflashed with the latest calibration if required

• 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

• Inspect mating connector – Ensure the vehicle-side connector is free from water, rust, and corrosion. Replace the mating connector if sealing is compromised

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

• Remove protective cap only when ready – Keep the sensor clean by removing the protective cap immediately before installation

Follow this sequence for proper installation:

1. Inspect the vehicle-side connector – Ensure the mating connector is dry, clean, and free from corrosion. The sealing plug and sealing ring must be intact to meet IP69 sealing requirements

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

3. Install the probe – Insert the sensor probe into the exhaust bung. Hand-tighten while holding the sensor body to prevent cable twisting

4. Torque properly – Recommended torque: 40–50 Nm (do not overtighten)

5. Connect the harness – Connect the mating 4-pin connector to the sensor. Ensure the connector interior is clean and dry. Lock the connector securely in place

6. 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. Follow these steps:

1. Install the sensor and securely connect the wiring harness

2. Clear all existing DTCs using a professional scan tool capable of commercial vehicle diagnostics (e.g., J1939 compatible tool)

3. Perform “NOx sensor replacement adaptation” – This function is typically found under “Special functions,” “SCR system,” or “Aftertreatment service” in diagnostic software. The ECU may command a specific warm-up sequence

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

5. Perform software reflash if required – Gen 2.0 sensors may need to be reflashed with the latest calibration to match your ECU

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 (higher readings under heavy load, lower readings at idle)

Without proper adaptation, you may still see DTCs (e.g., P225D, P225C) even with a brand new sensor.

• Water ingress prevention: Commercial vehicles operate in harsh weather conditions. Ensure the connector sealing is intact to prevent water ingress, which is one of the most common failure causes for this sensor

• Wiring harness condition: 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: This vehicle platform may use two NOx sensors (upstream and downstream of the SCR catalyst). Verify which position requires replacement. This sensor can be used in either position depending on the application

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

• Gen 2.0 advantages: The Gen 2.0 design offers improved accuracy, faster reaction time, and better waterproofing over earlier generation sensors

• 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. EPA 2010 compliance requires functioning NOx sensors

• 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 12-month warranty against manufacturing defects

The NOx Sensor 5WK96752C is a critical emissions aftertreatment component for 24V heavy-duty diesel commercial vehicles. As a Gen 2.0 sensor, it offers improved accuracy over earlier sensors, faster reaction time, ability to be reflashed with updated software, and enhanced waterproofing and dust/debris accumulation resistance.

Designed for Cummins diesel engine applications as well as DAF XF series trucks and Solaris buses, this sensor meets EPA 2010 emission standards. The sensor features a black square 4-pin connector, M20 x 1.5 thread size, and operates on a 24V power supply.

Cross-references for this sensor include 4326868, 4326868RX, 1928760, 1953530, 2872779, 2897311, 1862931, 2139930, 4326476, A045S162, and A2C95993600.

Proper selection (matching part number and cross-references), confirmation of 24V system voltage, careful installation with attention to connector waterproofing (IP69 sealing), and mandatory ECU adaptation ensure full emissions compliance, optimal fuel economy, and reliable SCR system performance.

Critical note on water ingress prevention: One of the most common failure modes for this sensor is water ingress at the connector due to sealing failure. Before installation, always inspect the vehicle-side mating connector for sealing integrity, rust, and corrosion. Ensure the sealing plug and sealing ring are intact and meet IP69 sealing class to prevent premature sensor failure.

Use this guide to confidently purchase and replace a failed 5WK96752C NOx sensor without compatibility issues or repeat failures.

For further technical support, refer to your engine or vehicle manufacturer’s service documentation or consult a qualified diesel emissions specialist.