FITMENT
Compatible with GM Duramax diesel trucks equipped with SCR (Selective Catalytic Reduction) AdBlue emission systems requiring NOx monitoring.
Common applications include:

• Chevrolet Silverado 2500 / 3500 HD (2014–2016 Duramax)
• GMC Sierra 2500 / 3500 HD (2014–2016 Duramax)
• 6.6L Duramax diesel engine platforms using SCR aftertreatment systems
  Using reference numbers:
• 12665215 (GM OEM part number)
• 5WK96631G (Continental/Bosch sensor family cross-reference)

Used in exhaust aftertreatment systems to ensure proper AdBlue dosing and emissions compliance.

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) levels in the exhaust and sends data to the ECU to control DEF/AdBlue injection and reduce emissions.

Q2: Where is it installed?
A2: It is mounted in the SCR exhaust system, typically upstream or downstream of the catalytic converter depending on system layout.

Q3: What are symptoms of failure?
A3: Check engine light, SCR/DEF warnings, NOx sensor fault codes, reduced engine power, or limp mode activation.

Q4: Is 12665215 interchangeable with 5WK96631G?
A4: Yes, 12665215 is the GM OEM number and 5WK96631G is the manufacturer cross-reference for the same SCR NOx sensor unit.