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

• Opel Insignia (diesel SCR variants)
• Opel Zafira
• Opel Cascada
• Vauxhall Insignia / Zafira / Cascada
  Using reference numbers:
• 55500320
• 55495341
• 55487270
• 55589458
• 5WK9 7419 / related NOx sensor family cross references (depending on calibration version)

Designed for SCR exhaust aftertreatment systems to measure NOx emissions and regulate 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 control AdBlue/DEF 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 engine layout.

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 are cross-reference OEM numbers used across Opel/Vauxhall SCR system revisions for the same NOx sensor family.