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:

• 04L907805EQ
• SNS0952A
• A3C00050800-01

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 regulation in 2.0 TDI platforms.

Symptoms / Fault Codes

Common symptoms of a faulty NOx sensor may include:

• Check engine light
• P2200 / P2201 fault codes (system dependent)
• SCR system warning
• Reduced engine performance
• Emission system malfunction

OE / Part Numbers

• 04L907805EQ
• SNS0952A
• A3C00050800-01

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 Group 2.0 TDI diesel engines equipped with Euro 5 / Euro 6 SCR emission systems.

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 similar VW NOx sensors?

Some Volkswagen NOx sensors have similar designs but are not universally interchangeable. Correct OE matching is required based on engine and ECU calibration.