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

Common applications include Volkswagen diesel platforms using the following reference number:

• 04L907805BE

Used in diesel exhaust aftertreatment systems for nitrogen oxide (NOx) monitoring and emission control.

Technical Description

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

It provides real-time signals to the engine control unit (ECU) to support SCR emission system regulation and diesel exhaust aftertreatment performance.

Symptoms / Fault Codes

Common symptoms of a faulty NOx sensor may include:

• Check engine light
• P2200 / P229F fault codes (system dependent)
• SCR system warning
• Reduced engine performance
• Emission system malfunction

OE / Part Numbers

• 04L907805BE

FAQ

What does a NOx sensor do?

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

Where is it used?

It is used in Volkswagen 2.0 TDI diesel engines equipped with SCR emission systems for exhaust gas monitoring.

What happens if it fails?

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

Is this part location-specific?

Yes. Depending on the vehicle, it may be installed as an upstream or downstream NOx sensor in the exhaust system.