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

• Chevrolet Express 2500 / 3500 (2010–2015 diesel SCR models)
• GMC Savana 2500 / 3500 (2010–2015 diesel SCR models)
• Chevrolet Silverado HD diesel (select 2010–2015 SCR-equipped variants)
• GMC Sierra HD diesel (depending on SCR configuration)

Using reference numbers:

• 12642310 (GM OEM part number)
• 5WK96631C (Continental/VDO sensor family cross-reference)
• SCR system NOx sensor variant for early GM Duramax emissions systems

This sensor is part of the exhaust aftertreatment system that monitors NOx emissions and ensures proper AdBlue dosing.

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

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

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

Q4: Is 12642310 the same as 5WK96631C?
A4: Yes, 12642310 is the GM OEM reference number and 5WK96631C is the supplier cross-reference for the same NOx sensor unit.