Fitment

Fits for:

• Chevrolet Silverado 2500HD / 3500HD (6.6L Duramax diesel)
• GMC Sierra 2500HD / 3500HD (6.6L Duramax diesel)
• Chevrolet Express / GMC Savana 2500 / 3500 vans (6.0L / 6.6L diesel)
• Engine: Duramax diesel engines with SCR (AdBlue / DEF) emissions system
• Model years: approx. 2010–2016 (depending on calibration and emission package)
• Position: Exhaust NOx sensor (SCR outlet / downstream sensor position)
• OE / Cross References: 12665215 / 5WK96631G / 19330002 / SNS631G / A2C89661000-01 / GM NOx sensor family

FAQ

Q1: Are 12665215 and 5WK96631G the same sensor?
A1: Yes. 12665215 is the GM OE number, and 5WK96631G is the matching NOx sensor reference used in Duramax SCR diesel systems.

Q2: What vehicles use this sensor?
A2: It is commonly used on GM 6.6L Duramax trucks like Silverado and Sierra 2500HD/3500HD, as well as Express and Savana diesel vans.

Q3: Is this inlet or outlet sensor?
A3: It is typically used as an outlet (downstream) NOx sensor in the SCR exhaust system.

Q4: What does this sensor do?
A4: It measures nitrogen oxide (NOx) levels in exhaust gases and sends data to the ECU, which adjusts DEF (AdBlue) dosing to reduce emissions and maintain SCR efficiency.