Fitment

Confirmed OE application based on OEM cross-reference data:

• Audi Q5 (FY platform) 2.0 / 3.0 TDI diesel variants
• Audi SQ5 (FY) diesel applications
• SCR (AdBlue) emission systems (EU6 diesel platforms)
• Upstream / downstream NOx sensor position depending on engine code

Fitment is strictly based on OE number matching: 80A907807D / 5WK97438

Verified OE cross-reference indicates this sensor family is widely used on Audi Q5 FY diesel platforms with V6/V8 TDI configurations and shared VAG SCR architecture.

Technical Description

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

It transmits real-time data to the ECU to control SCR (Selective Catalytic Reduction) dosing strategy, ensuring correct AdBlue injection and emissions compliance.

The sensor is an integrated electronic module designed for high-temperature exhaust environments and continuous emissions 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

• 80A907807D
• 5WK97438
• Continental / Vitesco reference family: SNS438 / A2C38401800-01

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 / D / L / M) can indicate different calibration or ECU compatibility.

What vehicles use this sensor?

It is commonly used on Audi Q5 and SQ5 diesel models within the FY platform generation, depending on engine and emission system configuration.

Can similar NOx sensors be used instead?

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