Fitment

Confirmed OE application based on available catalog listings:

• Volkswagen Caddy Alltrack (2015–2020) 2.0 TDI
• SCR (AdBlue) diesel emission systems
• Fitment strictly based on OE number matching: 04L907805N / 5WK97237

Compatibility must always be verified by OE number before installation.

This NOx sensor is used in diesel exhaust aftertreatment systems to measure nitrogen oxide (NOx) levels in exhaust gases and transmit data to the ECU for SCR emission control.

It supports AdBlue dosing strategy in diesel emission systems and helps maintain emissions compliance.

Technical Description

Installed in the exhaust aftertreatment system, this NOx sensor continuously measures nitrogen oxide concentration and sends signals to the engine control unit (ECU).

It is part of the SCR (Selective Catalytic Reduction) system used in modern Volkswagen diesel vehicles.

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

• 04L907805N
• 5WK97237

FAQ

What does this NOx sensor do?

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

Is this sensor vehicle-specific?

Yes. It is strictly matched by OE number and used only in compatible Volkswagen diesel applications.

Can similar NOx sensors be used instead?

No. Even small differences in OE suffix indicate different calibration or ECU compatibility.