Fitment (Market-Validated Usage)

Based on OEM catalog + aftermarket cross-reference listings, this NOx sensor is used in Volkswagen Group V6 TDI diesel SCR (AdBlue) systems, mainly on MLB / longitudinal diesel platforms.

Common system applications include:

• Audi A4 B8 2.0 TDI (selected configurations)
• Audi A5 2.0 TDI / 3.0 TDI diesel variants
• Audi A6 C6 / C7 2.0 TDI & 3.0 TDI diesel (depending on engine code)
• Audi Q5 8R 2.0 TDI diesel variants
• Volkswagen Touareg (7P / 7L V6 TDI diesel)
• SCR (AdBlue) diesel emission systems

Fitment is strictly based on OE number matching: 8K0907807N

OE cross-reference data confirms this part is widely used across multiple VW Group diesel applications and shared between Audi and Volkswagen platforms.

Technical Description

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

It is part of the SCR (Selective Catalytic Reduction) system, which uses AdBlue injection to reduce NOx emissions and maintain Euro 5 / Euro 6 compliance depending on application.

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

Symptoms / Fault Codes

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

OE / Part Numbers

• 8K0907807N
• 8K0 907 807 N (format variant)
• Related revisions in same family: 8K0907807K / 8K0907807D / 8K0907807Q

FAQ

Is this sensor vehicle-specific?

Yes. NOx sensors must match the exact OE number. Even small suffix differences (N / K / Q variants) can indicate different calibration, sensor length, or position.

Why are both Audi and Volkswagen listed?

Because Volkswagen Group shares the same diesel SCR architecture across multiple brands, especially on V6 TDI platforms.

Can similar OE numbers be used instead?

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