Fitment

Based on OE catalog and marketplace cross-reference data, 04L907805AL is used in Volkswagen Group diesel SCR (AdBlue) emission systems, commonly found across MQB / EA288-era diesel platforms depending on engine and ECU calibration.

Known applications include selected:

• Volkswagen Passat B8 diesel variants
• Volkswagen Arteon diesel variants
• Other VAG 2.0 TDI SCR-equipped models (OE-dependent)

Fitment is strictly based on OE number matching: 04L907805AL

Technical Description

This NOx sensor measures nitrogen oxide concentration in diesel exhaust gases and transmits real-time data to the ECU.

It is used in SCR (Selective Catalytic Reduction) systems to control AdBlue dosing and maintain emissions compliance in modern diesel engines.

The sensor is an integrated electronic module designed for high-temperature exhaust environments and continuous emissions monitoring.

Symptoms / Fault Codes

Common symptoms of failure include:

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

OE / Part Numbers

• 04L907805AL

FAQ

What does this NOx sensor do?

It measures nitrogen oxide levels in the exhaust and sends data to the ECU to control SCR (AdBlue) injection and emissions reduction.

Is this sensor vehicle-specific?

Yes. It is strictly matched by OE number. Even small suffix differences (AL / AP / AN etc.) indicate different 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 vehicles use this part?

It is used across Volkswagen Group diesel SCR systems, commonly including Passat and Arteon diesel applications depending on engine configuration.