Fitment

Compatible with Volkswagen Group diesel vehicles equipped with 3.0 TDI engines and SCR (Selective Catalytic Reduction) emission systems.

Common applications include Audi and VW platforms using this NOx sensor configuration:

• Audi Q5 (8RB) 3.0 TDI / SQ5 TDI quattro
• Volkswagen Group 3.0 TDI diesel engine applications
• SCR / AdBlue diesel emission systems

Fitment depends on engine code and ECU calibration (multiple variants exist within the 3.0 TDI platform).

Technical Description

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

It provides real-time data to the engine control unit (ECU) to support SCR system dosing control and emission regulation.

The sensor is typically mounted in the exhaust system upstream or downstream of the SCR catalyst depending on vehicle configuration.

Symptoms / Fault Codes

Common symptoms of a failing NOx sensor may include:

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

OE / Part Numbers

• 8R0907807L
• 5WK97255 (Continental reference)
• 70680086 (cross reference in some applications)

FAQ

What does a NOx sensor do?

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

Where is it used?

It is used in Volkswagen Group 3.0 TDI diesel engines, commonly on Audi Q5 / SQ5 platforms and related VAG vehicles.

Are all 8R0907807L sensors interchangeable?

Not always. Even with the same connector and housing, compatibility depends on ECU calibration and exact system configuration.

What happens if it fails?

It may trigger emission system warnings, fault codes, and reduced engine performance depending on the SCR strategy.