Fitment

Compatible with Volkswagen diesel vehicles equipped with 2.0 TDI engines and SCR (Selective Catalytic Reduction) emission systems.

This part number is used in Volkswagen Group diesel exhaust aftertreatment systems for nitrogen oxide (NOx) monitoring and emission control.

• 04L907805CT
• Volkswagen 2.0 TDI engine applications
• SCR / AdBlue diesel emission systems
• Commonly used on VAG platform vehicles (VW / Audi / Škoda / SEAT) depending on ECU calibration and model year

Technical Description

This NOx sensor is installed in diesel exhaust systems to measure nitrogen oxide concentration in the exhaust gas stream.

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

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

• 04L907805CT

FAQ

What does a NOx sensor do?

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

Where is it used?

It is used in Volkswagen 2.0 TDI diesel engines equipped with SCR/AdBlue systems to monitor exhaust gases before or after the catalyst depending on configuration.

What happens if it fails?

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

Is this part interchangeable with other Volkswagen NOx sensors?

Not always. Even if connectors and physical design appear similar, compatibility depends on OE number and ECU calibration.