Fitment
Compatible with Volkswagen Group Euro 6 diesel emission systems (SCR / AdBlue)

Vehicle applications include:
Audi A6
Audi A7 Sportback
Other VW Group 4G platform diesel vehicles using OEM part numbers 4G0907807J / 4G0907807L / 4G0907807S

FAQ

Q1: What is this NOx sensor used for?
A1: It measures nitrogen oxide levels in diesel exhaust and sends signals to the SCR system to control AdBlue (DEF) injection and reduce emissions.

Q2: Is this a front or rear sensor?
A2: This is typically a front (pre-catalyst / upstream SCR) NOx sensor, used to monitor NOx before treatment.

Q3: Are 4G0907807J, 4G0907807L, and 4G0907807S interchangeable?
A3: They are OEM revision variants within the same sensor family. Exact replacement must match vehicle engine code and calibration.

Q4: What vehicles commonly use this sensor?
A4: It is mainly used on Audi A6 and A7 C7 3.0 TDI (4G platform) diesel engines with SCR/AdBlue systems.

Q5: What are common failure symptoms?
A5: Engine warning light, AdBlue system faults, NOx signal errors, or limp mode activation.