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

Vehicle applications include:
Audi A4
Audi S4
Volkswagen Passat
Volkswagen Sharan
Other VW Group vehicles using OEM part number 8K0907807C / 5WK96638B

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

Q3: Are 8K0907807C and 5WK96638B interchangeable?
A3: Yes, 8K0907807C is the OEM number and 5WK96638B is a Continental aftermarket reference for the same sensor family.

Q4: Is this used across multiple VW platforms?
A4: Yes, it is used across B8 Audi and MQB-era VW diesel SCR systems including Passat and Sharan models.

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