Fitment

Confirmed OE application based on catalog cross-reference data:

• Audi A4 B9 (8W) 3.0 TDI V6
• Audi A5 (F5) 3.0 TDI
• Audi Q7 (4M) 3.0 TDI V6
• SCR (AdBlue) diesel emission systems on VAG MLB platform

Fitment is strictly based on OE number matching: 80A907807A / 5WK97315

Technical Description

This NOx sensor is used in diesel exhaust aftertreatment systems to measure nitrogen oxide concentration in exhaust gases.

It sends real-time signals to the ECU to control SCR (Selective Catalytic Reduction) dosing strategy and maintain emissions compliance in modern diesel engines equipped with AdBlue systems.

The sensor is part of the emissions monitoring system and is typically installed in the exhaust stream before or after the SCR catalyst depending on configuration.

Symptoms / Fault Codes

Common symptoms of failure may include:

• Check engine light
• P2200 / P229F fault codes (system dependent)
• SCR / AdBlue system warning
• Reduced engine power (limp mode)
• Increased emissions

OE / Part Numbers

• 80A907807A
• 5WK97315

FAQ

What does this NOx sensor do?

It measures nitrogen oxide levels in diesel exhaust gases and sends data to the ECU for SCR emission control.

Is this sensor vehicle-specific?

Yes. It is strictly matched by OE number. Even small suffix differences (A / B / N versions) indicate different calibration or hardware revision.

Which vehicles use this part?

It is commonly used in Audi Q7 (4M) and V6 3.0 TDI applications within the Volkswagen Group diesel SCR system.