Fitment

Based on OE catalog cross-reference data, 8W0907807D / 5WK97432 is used in Volkswagen Group EA288 / MQB diesel SCR (AdBlue) systems, especially on mid-size Audi and VW diesel platforms.

Common applications include:

• Audi A4 (B9 / 8W platform) 2.0 TDI
• Audi A5 (F5 platform) 2.0 TDI
• Audi A4 Allroad (8W) diesel variants
• Volkswagen Passat B8 2.0 TDI (EA288 engine)
• SCR (AdBlue) diesel emission systems (Euro 6 EA288 architecture)

Fitment is strictly based on OE number matching: 8W0907807D / 5WK97432

OE catalog data confirms this sensor is part of the Continental/Vitesco NOx sensor family used across EA288 SCR systems.

Technical Description

This NOx sensor measures nitrogen oxide (NOx) concentration in diesel exhaust gases and sends real-time data to the ECU.

It is part of the SCR (Selective Catalytic Reduction) system and controls AdBlue dosing strategy to reduce emissions and maintain Euro 6 compliance.

The sensor is an integrated electronic module designed for continuous high-temperature exhaust monitoring.

Symptoms / Fault Codes

Common symptoms of failure may include:

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

OE / Part Numbers

• 8W0907807D
• 5WK97432
• Continental / Vitesco reference family: SNS728A (variant-dependent)

FAQ

What does this NOx sensor do?

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

Which vehicles use this part?

It is commonly used in Audi A4 B9, A5 F5, and Volkswagen Passat B8 diesel models equipped with EA288 engines.

Is this sensor vehicle-specific?

Yes. It is strictly matched by OE number. Even small suffix differences (D / K / P variants) can indicate different ECU calibration or sensor position.

Can similar NOx sensors be used instead?

Not recommended. NOx sensors are ECU-calibrated components and must match exact OE specification.