Fitment

Chevrolet GMC diesel vehicles with SCR AdBlue emission system including

• Chevrolet Silverado 2500HD 6.6L Duramax diesel
• Chevrolet Silverado 3500HD 6.6L Duramax diesel
• Chevrolet Express 2500 6.6L diesel
• Chevrolet Express 3500 6.6L diesel
• GMC Sierra 2500HD 6.6L diesel
• GMC Sierra 3500HD 6.6L diesel
• GMC Savana 2500 / 3500 6.6L diesel
• Opel / Vauxhall selected GM diesel SCR applications (regional variants)

OE reference
12665216
5WK96645G
1266 5216

FAQ

What is this NOx sensor used for

It measures nitrogen oxide levels in diesel exhaust gas and sends data to ECU for SCR AdBlue emission control system

Is this inlet or outlet sensor

It is used in SCR aftertreatment system and may function as inlet or outlet depending on vehicle configuration

Are all 12665216 sensors interchangeable

No GM NOx sensors are ECU coded and must match exact OE number and calibration version

What system does it work with

SCR Selective Catalytic Reduction system using AdBlue injection for diesel emission compliance

What are common failure symptoms

Engine warning light SCR AdBlue fault reduced power limp mode NOx sensor communication error emission efficiency faults