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

Vehicle applications include:
Audi A6
Audi S6
Audi A7 Sportback
Audi S7
Other VW Group 4G platform diesel vehicles using OEM part numbers 4G0907807S / 4G0907807AA / 4G0907807L / 4G0907807D

FAQ

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

Q2: Is this a front or rear sensor?
A2: These part numbers are typically used in the SCR NOx monitoring system and may be installed as upstream or downstream sensors depending on engine layout and ECU calibration.

Q3: Are all listed part numbers interchangeable?
A3: They are OEM revision variants within the same sensor family. However, correct replacement must match the vehicle’s engine code and software calibration.

Q4: Which engines use this sensor?
A4: It is mainly used on Audi C7 platform 3.0 TDI diesel engines (4G chassis) with SCR/AdBlue systems.

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