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.

• 04L907805DA
• Volkswagen 2.0 TDI engine applications
• SCR / AdBlue diesel emission systems
• VAG platform diesel emission system configurations (fitment depends on ECU calibration and exhaust layout)

Technical Description

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

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

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

• 04L907805DA

FAQ

What does a NOx sensor do?

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

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.