Fitment

Compatible with Volkswagen Group diesel vehicles equipped with SCR (Selective Catalytic Reduction) emission systems.

Fitment is strictly based on OE number matching.

• 03L907807T
• 5WK96798
• Volkswagen / Volkswagen Group diesel SCR systems

Technical Description

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

It provides real-time data to the engine control unit (ECU) to support SCR emission control and dosing strategy for AdBlue systems.

The sensor communicates measured NOx values to ensure proper operation of diesel emission reduction systems.

Symptoms / Fault Codes

Common symptoms of a failing NOx sensor may include:

• Check engine light
• P2200 / P229F fault codes (system dependent)
• SCR / emission system warning
• Reduced engine performance / limp mode
• Increased emissions

OE / Part Numbers

• 03L907807T
• 5WK96798

FAQ

What does this NOx sensor do?

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

Is this sensor vehicle-specific?

Yes. Compatibility is determined strictly by OE number matching only.

Can similar part numbers be interchangeable?

Not always. Even small OE differences may indicate different calibration or ECU compatibility.

What system is it used in?

It is used in diesel exhaust aftertreatment systems with SCR (AdBlue) emission control.