Fitment

Confirmed OE application based on OEM catalog listing:

• Volkswagen Group vehicles (VW / Audi / Škoda / SEAT / CUPRA)
• Diesel engines equipped with SCR (AdBlue) emission systems
• NOx sensor position varies (upstream / downstream depending on configuration)

Fitment is strictly based on OE number matching: 04L907807DE

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 regulate SCR (Selective Catalytic Reduction) dosing strategy and maintain emissions compliance.

The sensor is part of the AdBlue/SCR emission monitoring system used in modern diesel vehicles.

Symptoms / Fault Codes

Common symptoms of a failing NOx sensor may include:

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

OE / Part Numbers

• 04L907807DE

FAQ

What does this NOx sensor do?

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

Is this sensor vehicle-specific?

Yes. It is strictly matched by OE number. Even small suffix differences indicate different calibration or system configuration.

Can similar NOx sensors be used instead?

No. NOx sensors are ECU-calibrated components and must match exact OE specifications.