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.

• 04L907807AP
• Volkswagen 2.0 TDI diesel engine applications (EA288 platform variants)
• SCR / AdBlue diesel emission systems
• Commonly used on VW diesel models such as Jetta, Passat, Beetle (fitment depends on ECU calibration and model year)

Technical Description

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

It transmits real-time data to the engine control unit (ECU) to support SCR system dosing control and emission regulation strategy.

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 / limp mode
• Increased emissions

OE / Part Numbers

• 04L907807AP
• Supersession: 04L907807AB / 04L907807Q (depending on system revision)

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 2.0 TDI diesel engines equipped with SCR/AdBlue emission systems to monitor exhaust gases before or after the catalytic converter 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 similar Volkswagen NOx sensors?

Not always. Even if the connector and housing look similar, compatibility depends on OE number and ECU calibration. Proper matching is required.