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

• Opel Insignia (diesel SCR variants)
• Opel Antara
• Chevrolet Captiva (diesel SCR variants)
• Vauxhall Insignia / Antara
• Selected GM Euro 5 / Euro 6 SCR diesel platforms

Using reference numbers:

• 55512780
• 55495340
• 55488276
• A3C04398900-01
• Related SCR NOx sensor family cross-references depending on system version

This sensor is used in the exhaust aftertreatment system to measure NOx emissions and control AdBlue/DEF dosing.

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

Q2: Where is it installed?
A2: It is installed in the SCR exhaust system, typically before or after the catalytic converter depending on vehicle configuration.

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

Q4: Are these part numbers interchangeable?
A4: Yes, these OEM numbers are cross-references within the same GM/Opel SCR sensor family, but exact fitment depends on engine and ECU calibration.