Fitment

Chevrolet / GMC diesel vehicles with SCR AdBlue emission system including

• Chevrolet Cruze 2.0L Diesel (2014–2015)
• Chevrolet Orlando 2.0L Diesel (selected markets)
• Opel / Vauxhall diesel SCR platforms (selected GM applications)
• GM light diesel Euro 5 / Euro 6 SCR systems (regional variants)

OE reference
12641556
5WK96735
12662658 (interchange variant)
A2C15799000-01 (cross reference in some catalogs)

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 commonly used as NOx Position 1 (upstream) sensor depending on SCR system layout

Are 12641556 and 12662658 interchangeable

Yes, they are often cross-referenced depending on calibration and vehicle application, but ECU matching is still required

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