Fitment

Fits for:

• General Motors diesel applications (Duramax / light & heavy-duty SCR systems depending on platform)
• Chevrolet Silverado HD / GMC Sierra HD diesel SCR (select Euro/US emission configurations)
• GM trucks using Continental / Vitesco NOx sensor generation 5WK97391A family
• Engine: Duramax 6.6L L5P / LML SCR systems (varies by year and emissions setup)
• Position: NOx Sensor (Position 2 – downstream / outlet depending on system layout)
• OE / Cross References: 55495041 / 5WK97391A / 24001920 / 55496923 / SNS-type NOx sensor family

FAQ

Q1: Are 55495041 and 5WK97391A the same sensor?
A1: Yes. 55495041 is the GM OE number and 5WK97391A is the Continental/Vitesco reference used for the same NOx sensor assembly in SCR systems.

Q2: What vehicles use this sensor?
A2: It is commonly used on GM diesel trucks such as Chevrolet Silverado HD and GMC Sierra HD equipped with SCR (AdBlue) emissions systems depending on model year and engine variant.

Q3: What does “Position 2” mean?
A3: “Position 2” typically refers to the downstream (outlet) NOx sensor located after the SCR catalyst, used to monitor system efficiency.

Q4: What does this sensor do?
A4: It measures nitrogen oxide (NOx) levels in exhaust gases and sends data to the ECU to control AdBlue dosing and ensure emissions compliance.