FITMENT
Compatible with Volkswagen Group diesel vehicles (VW / Audi / Skoda / Seat) equipped with SCR (Selective Catalytic Reduction) systems requiring NOx monitoring.
Common applications include Euro 6 diesel engines using reference SNS709 / 4M0907807AA.

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 control AdBlue/DEF injection and maintain emissions compliance.

Q2: Where is it installed?
A2: It is installed in the exhaust system, typically upstream or downstream of the SCR catalyst depending on OEM configuration.

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

Q4: Is it compatible with all VW Group vehicles?
A4: No, compatibility depends on engine code, emissions standard, and SCR system layout.