Fitment
Compatible with Volkswagen Group Euro 6 diesel emission systems (SCR / AdBlue depending on engine variant)

Vehicle applications include:
Seat Alhambra
Volkswagen Sharan
Audi A4
Audi Q7
Other VW Group diesel platforms using OEM part numbers 03L907807AF / 03L907807AD / 5WK96737

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: Are 03L907807AF and 03L907807AD interchangeable?
A2: They are closely related OEM variants in the same sensor family, but exact compatibility depends on engine version and calibration.

Q3: Where is this sensor installed?
A3: It is installed in the exhaust aftertreatment system, typically before or after the SCR catalyst depending on vehicle configuration.

Q4: Is this used across multiple VW Group models?
A4: Yes, it is used across VW Group MQB/MLB diesel SCR platforms including Sharan, Alhambra, A4, and Q7.

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