Fitment

Based on OE catalog cross-reference data, 04L907805AP belongs to the Volkswagen Group diesel SCR (AdBlue) emissions system family and is used across selected VAG diesel applications where ECU calibration matches this specific revision.

Fitment is strictly based on OE number matching: 04L907805AP

Technical Description

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

It sends real-time signals to the ECU to support SCR (Selective Catalytic Reduction) system operation and AdBlue dosing control, ensuring emissions compliance in modern diesel engines.

The sensor is an integrated electronic module used in Euro 5 / Euro 6 diesel emission systems depending on configuration.

Symptoms / Fault Codes

Common symptoms of failure 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

• 04L907805AP

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. Compatibility is strictly determined by OE number matching. Even small suffix differences (AP vs AN / AH / etc.) indicate different ECU calibration or hardware revision.

Can similar NOx sensors be used instead?

Not recommended. NOx sensors are ECU-calibrated components and must match the exact OE specification.

Which systems use this part?

It is used in Volkswagen Group diesel SCR (AdBlue) emission systems across selected models depending on engine and ECU configuration.