Fitment

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

Common applications include Volkswagen Group diesel platforms using the following reference numbers:

• 04L907805EJ
• SNS0952A
• A2C19776200-02
• 04L907805EF (cross reference in some systems)

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 sends real-time signals to the engine control unit (ECU), supporting SCR system operation and diesel emission control in 2.0 TDI platforms.

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
• Emission system malfunction

OE / Part Numbers

• 04L907805EJ
• SNS0952A
• A2C19776200-02
• 04L907805EF (reference equivalent in some applications)

FAQ

What does a NOx sensor do?

It measures nitrogen oxide levels in diesel exhaust systems and sends data 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 interchangeable with other VW NOx sensors?

Some Volkswagen NOx sensors share similar architecture, but interchangeability depends on ECU calibration and OE matching.