Fitment

Confirmed OE application based on catalog cross-reference:

• Audi A4 B8 (8K chassis) 2.0 TDI
• Audi A5 (8T / 8F platform variants) 2.0 TDI
• Audi Q5 (8R facelift) 2.0 TDI
• SCR (AdBlue) diesel emission systems

Fitment is based strictly on OE number matching: 8K0907807J / 5WK97205.

Technical Description

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

It transmits real-time data to the ECU to manage SCR (Selective Catalytic Reduction) dosing strategy and maintain emission compliance in diesel vehicles.

The sensor is part of the emissions monitoring system used in modern VAG diesel platforms equipped with AdBlue systems.

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

• 8K0907807J
• 5WK97205

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. Compatibility is strictly determined by OE number matching. Even small suffix differences may indicate different ECU calibration.

Can similar Audi NOx sensors be interchangeable?

Not always. NOx sensors are ECU-calibrated components and must match exact OE specifications.