Medium Duty Diesel Engine Auto NOx Sensor 2894943 1869930PRX EPA 2010 Custom

The 5WK96672A is a precision-engineered planar dual-cell limiting current type nitrogen oxide (NOx) sensor designed for 12V medium-duty diesel engine exhaust aftertreatment systems equipped with Selective Catalytic Reduction (SCR). It is an electrochemical sensor that continuously monitors the concentration of nitrogen oxides in the exhaust stream and communicates with the Engine Control Module (ECM) via digital CAN bus protocol. This real-time feedback enables precise SCR system control and regulatory compliance with EPA 2010, Euro V, Euro VI, and equivalent emission standards.

The sensor consists of a ceramic sensing element with platinum electrodes and an integrated electronic control unit, forming a single unit installed in the exhaust gas system. The high-quality insulated wiring harness and reinforced connectors are designed to withstand engine bay vibrations and heat, reducing failure risks in heavy-duty diesel environments.

The NOx sensor transmits the NOx value in the exhaust gas to the ECU in real time after normal operation. The ECU does not merely judge whether the exhaust gas is qualified by monitoring the real-time NOx value; rather, it detects whether the NOx value in the exhaust gas exceeds the standard through a set of nitrogen oxide monitoring programs.

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

• Upstream (pre-SCR) – Installed before the exhaust-gas treatment system, providing real-time feedback to precisely meter Diesel Exhaust Fluid injection.

• Downstream (post-SCR / System Outlet) – Installed after the SCR catalyst to confirm that legislated emissions limits have not been exceeded.

The 5WK96672A is typically designated as an Outlet Sensor in many applications, though mounting position should always be verified against original equipment.

Important: The 5WK96672A operates on a 12V system voltage. 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 before purchase. Do not install on 24V systems.

The following part numbers are directly interchangeable with 5WK96672A. 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, voltage rating, and thread size before purchasing.

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

• The PEX 193NOX2003 NOx sensor is a direct-fit replacement for Continental 5WK96672A (also cross-referenced as 5WK96672) and select OEM references.

• Dinex 5EL001 is listed as a direct aftermarket replacement for Continental 5WK96672A and 5WK9 6672A, as well as OEM numbers 2871974, 2894943, 2894943RX, 4984912, 1869930PRX, and 6428405.

• MCT Technic sensors cross-reference 2894943, 2894943RX, and 2894943NX to Continental 5WK96672A.

• ATP branded sensors replace OEM numbers 5WK96672 and 5WK96672A directly.

⚠️ Important: The underlying Continental reference number (5WK96672A / 5WK96672) is the best way to ensure correct functionality. OEM names and numbers are for identification purposes only; the Continental reference number should be your primary cross-reference to guarantee a proper match. Always check the original OE part number located on the back of the old unit; if in doubt, consult the supplier before purchasing.

The 5WK96672A NOx sensor is designed for 12V commercial vehicle electrical systems and is primarily used with diesel engines in medium-duty and heavy-duty commercial vehicle applications. This sensor is most closely associated with engines meeting EPA 2010 emission standards.

This sensor is widely used across medium to heavy-duty diesel engine platforms in commercial vehicle, truck, and bus applications.

Based on cross-reference information and supplier listings, the 5WK96672A is compatible with the following engine platforms:

The 5WK96672A sensor is certified for use in the following commercial vehicle platforms (model years approximately 2010–2015):

The 5WK96672A is designed for vehicles meeting:

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

• Euro V / Euro VI – European emissions standards

• Equivalent Tier standards for off-road equipment

• Meets EPA and EU emissions standards, ensuring legal operation across regulated markets

The 5WK96672A is typically specified as an Outlet Sensor (downstream of SCR catalyst) in many applications, though some configurations use it in the upstream position. Verify the correct position on your vehicle before installation, as some platforms use two NOx sensors (upstream and downstream) while others use only one.

• Upstream (pre-SCR) – Measures engine-out NOx before entering the SCR catalyst for real-time dosing control

• Downstream (post-SCR / System Outlet) – Measures treated exhaust after the SCR catalyst to verify emissions compliance and system efficiency

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 Continental part number 5WK96672A or 5WK96672 (located on the back of the old unit).

2. Verify voltage – The 5WK96672A is a 12V sensor; confirm your vehicle electrical system is 12V

3. Count connector pins – Square 4-pin sealed connector type

4. Measure cable length – Approximately 600–800 mm depending on application (verify against original)

5. Confirm thread size – M20 x 1.5

6. Verify vehicle model year – This sensor is typically used for vehicles from model years approximately 2010 through 2015 (EPA 2010 compliance)

7. Check engine platform – Confirm compatibility with ISB, ISL, ISX, ISC, or ISBE/ISLE engine platforms

⚠️ Important note: Compatibility extends beyond physical fitment. The sensor must match the ECU‘s CAN communication protocol. Different vehicle manufacturers may use different calibration parameters even when the physical sensor appears identical. The underlying Continental reference number (5WK96672A) is the most reliable identifier for correct functionality. Always reference your original sensor‘s Continental part number or consult vehicle-specific documentation before purchasing.

A degraded or failed 5WK96672A 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.

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 the NOx sensor provides faulty readings, the ECU enters a default or “limp” mode to protect the engine and emission system. In this state, fuel and air delivery are restricted, leading to noticeable power loss, sluggish acceleration, and poor throttle response. Stalling or slow acceleration are common complaints when the sensor is failing.

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.

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.

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.

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.

Before replacing the 5WK96672A, perform these basic checks:

1. Visual inspection – Look for damaged cable insulation, chafing against chassis components, bent pins, or a melted/cracked connector

2. Check DTC status – Using a diagnostic scan tool, verify which codes are present and whether they are active or intermittent

3. Voltage supply – With key on and engine off, verify 12V power at the sensor connector (do not apply 24V)

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

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

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 5WK96672A 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 and correct identification of the Continental reference number.

• Match the full Continental number on your original sensor – 5WK96672A or 5WK96672. The underlying Continental reference number is the most reliable way to ensure correct functionality.

• Match the full printed OEM number on your original sensor. OEM part numbers are located on the back of the old unit.

• Check for suffix variations – The “A” suffix may indicate a production revision.

• Avoid “universal fit” listings – The 5WK96672A is a specific digital device; generic sensors are unlikely to communicate correctly with your ECU.

• If in doubt about compatibility, consult the supplier with your original sensor’s part number before purchasing.

• Reputable supplier – Choose a supplier with documented quality control and a minimum 6–12 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.

• Price guideline – Authentic quality replacements typically range from approximately $110 to $375:

  • Economy/Standard aftermarket: $110–$150 (ECCPP, etc.)

  • Premium aftermarket: $170–$285 (PEX, MCT, etc.)

  • Dinex Next Generation 2.0 (software re-flashing technology): approximately $373

  • Suspiciously low prices (below $80) may indicate counterfeit or defective products

• Packaging – New sensors should be shipped in protective packaging with a protective cap over the ceramic tip

• Next Generation technology – Consider sensors with software re-flashing capability (e.g., Generation 2.0) for future OE software update compatibility.

• 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

• 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

• Future-proof capability – Some replacement sensors feature future-proof software re-flashing technology to ensure compatibility with OE software updates.

Follow this sequence for proper installation:

1. Prepare the mounting location – Allow the exhaust system to cool before removal

2. Remove the old sensor – Carefully remove the faulty sensor from the exhaust bung

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

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

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

6. Torque properly – Recommended torque for M20 x 1.5 threads: 40–60 Nm

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

8. 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.

What DOES NOT work: Attempting to clear deep-level adaptation memory by disconnecting the battery is ineffective on modern emissions systems and may trigger secondary faults.

What DOES work:

1. Install the sensor and securely connect the wiring harness

2. Connect a professional diagnostic scan tool (SAE J1939 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

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

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., 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 5WK96672A is a 12V sensor. Verify your vehicle‘s electrical system voltage before purchase

• Wiring harness condition: Commercial vehicles operate in harsh environments. 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. Verify which position requires replacement

• ECU software updates: In some cases, a recurring NOx sensor issue may be addressed by an ECU software update rather than repeated sensor replacement. Generation 2.0 sensors are designed with improved protection against OE software updates

• Check the original Continental number – OEM part numbers are located on the back of the old unit; use this as your primary reference

• 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

• The 5WK96672A meets EPA and EU emissions standards, ensuring legal operation and reduced environmental impact

The NOx Sensor 5WK96672A is a critical emissions aftertreatment component for 12V medium-duty diesel commercial vehicles. Unlike many other sensors in the 5WK96xxx series which operate on 24V, the 5WK96672A is specifically designed for 12V systems and is primarily used with diesel engines in Freightliner trucks, Blue Bird buses, International vehicles, Kenworth, Peterbilt, and other medium-to-heavy duty commercial applications, meeting EPA 2010 emission standards.

Key cross-references: 5WK96672, 2894943, 2894943RX, 2894943NX, 2871974, 4984912, C2894943, A034X849, 1869930PRX, 6428405, 1861423PRX, 193NOX2003, 5EL001, NOX-5EL001, NOX-CXX-004, 5462439, 5462439RX

Key technical specifications:

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

• Response time: Sub-second (< 1 second)

• Operating temperature: -40°C to 950°C

• Thread: M20 x 1.5

• Torque specification: 40–60 Nm

Compatible engine platforms:

• ISB / ISBe (6.7L)

• ISC / ISCe (8.3L)

• ISL / ISLe (8.9L)

• ISX (with OEM compatibility)

• QSB (industrial)

• B Series (3.9L – 6.7L)

Vehicle applications (representative):

• Freightliner: 108SD, 122SD, B2, Cascadia, Columbia, M2 112, XC Straight Rail

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

• International: Various platforms

• Kenworth / Peterbilt: Various models

Installation requirements:

• Do NOT apply anti-seize to threads

• 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

• Use the Continental reference number (5WK96672A / 5WK96672) as your primary identifier for correct functionality

• Generation 2.0 replacement sensors offer software re-flashing capability for future OE software update compatibility

CRITICAL NOTE – VOLTAGE COMPATIBILITY: The 5WK96672A 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.

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. Software calibration is mandatory.

Proper selection (matching the Continental part number 5WK96672A), confirmation of 12V system voltage, careful installation using correct torque (40–60 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 5WK96672A 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.