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

Vehicle applications include:
Audi Q7
Audi Q8
Volkswagen Touareg
Other VW Group MLB EVO diesel platforms using OEM part numbers 4M0907807BG / 4M0907807BD

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) dosing and reduce emissions.

Q2: Are 4M0907807BG and 4M0907807BD the same?
A2: 4M0907807BG is the updated OEM version, and 4M0907807BD is an earlier revision. They are closely related within the same sensor family, but replacement must still match ECU calibration.

Q3: Where is this sensor installed?
A3: It is installed in the exhaust aftertreatment system, typically as an SCR inlet or outlet NOx sensor depending on engine configuration.

Q4: Which engines commonly use it?
A4: It is mainly used on VW Group 3.0 TDI and 4.0 TDI diesel engines (MLB EVO platform) in Audi Q7, Q8, and VW Touareg models.

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