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

Vehicle applications include:
Audi A4
Audi A5
Other VW Group MLB 2.0 TDI SCR platforms using OEM part numbers 8W0907807C / 5WK97258

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: Is this upstream or downstream sensor?
A2: It can be used in SCR inlet or outlet positions depending on the vehicle configuration, but calibration must match the OEM part number exactly.

Q3: Are 8W0907807C and 5WK97258 interchangeable?
A3: 8W0907807C is the OEM Audi/VW number, while 5WK97258 is a Continental aftermarket reference for the same sensor family.

Q4: Is this used only in Audi A4/A5?
A4: It is primarily used in Audi A4 B9 and A5 B9 2.0 TDI models (2015–2018), but may also appear in other VW Group MLB diesel vehicles.

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