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

• Audi A4 B9 (8W2 / 8W5)
• Audi A5 (F5)
• 2.0 TDI / 3.0 TDI Quattro (8W platform)
  Using reference NOx sensor systems fitted to Euro 6 AdBlue diesel engines.

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

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

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

Q4: Is it compatible with all A4/A5 8W models?
A4: No, compatibility depends on engine code (2.0 TDI or 3.0 TDI), model year, and SCR system setup.