🚗 Fitment

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 part numbers:

• 04L907805DD
• SNS0900C
• A3C00049800-02

Used in exhaust emission systems for nitrogen oxide (NOx) measurement and emission control.

⚙️ Technical Description

This NOx sensor is used in diesel exhaust aftertreatment systems to monitor nitrogen oxide levels in the exhaust stream.

The sensor communicates with the engine control unit (ECU) to support emission regulation strategies in SCR systems.

⚠️ Symptoms / Fault Conditions

Common symptoms of a faulty NOx sensor include:

• Check engine light
• P2200 / P229F fault codes (may vary by ECU system)
• Reduced engine performance
• SCR system warning
• Emission system malfunction

🔢 OE / Part Numbers

This part replaces or corresponds to:

• 04L907805DD
• SNS0900C
• A3C00049800-02

❓ FAQ

What does a NOx sensor do?

A NOx sensor measures nitrogen oxide levels in diesel exhaust systems and sends data to the ECU for emission control.

Where is the NOx sensor used?

It is used in diesel vehicles equipped with SCR emission systems to monitor exhaust gases before and after the catalytic converter.

What happens if the NOx sensor fails?

Failure may cause emission system warnings, fault codes, and reduced engine performance depending on the vehicle system.

Does this part require coding after installation?

Some vehicles may require ECU adaptation depending on the system configuration.