Fitment

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

Vehicle applications include:
Audi A4 B9
Audi A5 B9
Audi S5
Audi A4 Allroad
Audi A5 Sportback / Cabriolet

Other VW Group diesel platforms using OEM 8W0907807Q / 8W0907807E / 8W0907807L / 8W0907807E / 5WK97434

FAQ

Q1: What is this NOx sensor used for?

A1: It measures nitrogen oxide (NOx) levels in diesel exhaust and sends data to the SCR system to control AdBlue (DEF) injection and reduce emissions.

Q2: Are 8W0907807Q, 8W0907807E, 8W0907807L interchangeable?

A2: Yes. These are OEM revision variants of the same NOx sensor family used across VW Group B9 platform diesel engines. Exact replacement must still match engine code and ECU calibration.

Q3: What is 5WK97434?

A3: 5WK97434 is the Continental aftermarket reference number corresponding to the same OEM VW/Audi NOx sensor family. (autodoc.de, ic24.uk)

Q4: Where is this sensor installed?

A4: It is installed in the exhaust aftertreatment system, typically as SCR inlet or outlet NOx sensor depending on configuration.

Q5: What engines use this sensor?

A5: Mainly VW Group 2.0 TDI and 3.0 TDI Euro 6 diesel engines on the MLB / B9 platforms.

Q6: What are common failure symptoms?

A6:

• Engine warning light
• AdBlue / SCR system fault
• NOx signal error
• Limp mode (reduced power)