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

Vehicle applications include:
Audi A6 Allroad
Audi A7 Sportback
Other VW Group 4G platform diesel vehicles using OEM part numbers 4G0907807AB / 4G0907807M / 4G0907807AF

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: Where is this sensor installed?
A2: It is installed in the exhaust aftertreatment system, typically upstream or downstream of the SCR catalyst depending on engine configuration.

Q3: Are these part numbers interchangeable?
A3: These are OEM variants within the same sensor family, but exact matching is required due to calibration and software differences.

Q4: Is this used only for A6 Allroad and A7?
A4: It is mainly used on Audi A6 Allroad and A7 Sportback C7 facelift diesel SCR systems (2015–2018).

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