Diesel Engine Auto Nox Sensor Replacement Cummins 2894941 3687334 3687334RX

The 5WK96673A is a high-precision, planar dual-cell limiting current type nitrogen oxide (NOx) sensor, designed for 12V medium-duty and heavy-duty diesel engine exhaust aftertreatment systems. This electrochemical sensor continuously monitors the concentration of nitrogen oxides (NOx) in the exhaust stream and communicates with the Engine Control Unit (ECU) via digital CAN bus (SAE J1939) protocol. This real-time feedback allows for precise control of the Selective Catalytic Reduction (SCR) system, ensuring compliance with stringent emission standards such as EPA10, Euro V, Euro VI, and others.

The sensor integrates a zirconium dioxide (ZrO₂) ceramic sensing element with an electronic control unit into a single, robust unit that is installed directly in the exhaust system. It is designed to meet the demands of heavy-duty applications, providing long service life and reliable operation.

The 5WK96673A NOx sensor is a direct replacement for a number of original equipment (OE) part numbers. When searching for a new sensor, it is crucial to verify the part numbers match, as using the wrong part will lead to communication errors and system failure. Always match the Continental reference number (5WK96673A) to ensure correct functionality.

⚠️ Important: Confirm your original sensor‘s OE part number on the back of the old unit. If uncertain, rely on the Continental number 5WK96673A for the most accurate fit. This is true for all forms of this part, including 5WK96673A OEM, 5WK96673A CUM, and the standard 5WK96673A.

The 5WK96673A is specifically engineered for 12V diesel engines and is most commonly associated with Cummins engine platforms. It is frequently used as a System Outlet (downstream) sensor, installed after the SCR catalyst, to verify emissions compliance.

• Cummins ISX: 11.9L to 15L heavy-duty engines (e.g., ISX15 14.9L). This sensor is a known replacement for the upstream engine outlet on a 2011 Peterbilt 387 with a Cummins ISX 15.0L engine.

• Cummins ISB / ISBe / ISC / ISL: 6.7L, 8.3L, and 8.9L platforms commonly found in medium-duty trucks and buses.

• Cummins QSB / QSL: Industrial and off-highway applications.

• Other Engines: Some compatibility with Ford 6.7L Power Stroke diesel engines (model years 2011-2016).

This sensor is compatible with a wide range of commercial vehicles, predominantly those powered by Cummins engines, including but not limited to:

⚠️ Note: Before purchase, always verify your specific vehicle's engine and model year to ensure cross-references match the original sensor’s specifications.

A failing or contaminated 5WK96673A NOx sensor will manifest various drivability and performance issues. Early diagnosis and replacement can prevent costly damage to other exhaust aftertreatment components like the SCR catalyst and DEF injector.

• Reduced Engine Performance / Limp Mode: The vehicle may go into a “limp” or derate mode to prevent emissions violations, resulting in a dramatic loss of power and restricted speed.

• Illuminated Warning Lamps: The malfunction indicator lamp (MIL) or check engine light will illuminate on the dashboard. An illuminated SCR or engine warning lamp is a clear sign.

• Increased Fuel Consumption: The ECU may compensate for inaccurate NOx data by altering the fuel/air mixture, leading to a noticeable drop in fuel efficiency.

• Poor Engine Starting / Cold Start Problems: You may experience rough idling, engine hesitation, or difficulty starting when the engine is cold.

• Excessive DEF Consumption or System Failure: A faulty sensor can send incorrect signals to the ECU, causing the SCR system to over-inject Diesel Exhaust Fluid (DEF) or causing the SCR system to stop injecting DEF altogether.

• Failed Emissions Test: The vehicle will likely fail a state-mandated emissions inspection due to the inability of the SCR system to properly reduce tailpipe NOx.

• Associated Diagnostic Trouble Codes (DTCs):

  • P2200: NOx Sensor Circuit / Open (Bank 1)

  • P2201: NOx Sensor Circuit Range/Performance (Bank 1)

  • P229F: NOx Sensor Circuit Intermittent/Erratic

  • P229E: NOx Sensor Circuit Signal Plausibility Failure

  • U05A2: Erroneous Signal (Dew point reached with ignition off / timeout)

  • P225C / P225D: NOx Sensor 1/1 Performance, Signal Stuck High/Low

  • P20EE: SCR NOx Catalyst Efficiency Below Threshold

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Company Overview Hefei Ruimin Auto Sensor Co., Ltd. (hereinafter referred to as “Hefei Ruimin”) is a leading manufacturer and global trader specializing in the R&D, production, and sales of high-quality automotive sensors. Headquartered in Hefei, a renowned technology and industrial ... Company Overview Hefei Ruimin Auto Sensor Co., Ltd. (hereinafter referred to as “Hefei Ruimin”) is a leading manufacturer and global trader specializing in the R&D, production, and sales of high-quality automotive sensors. Headquartered in Hefei, a renowned technology and industrial ...

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