Fitment

Based on OE catalog data, 4M0907807AL is used in Volkswagen Group MLB Evo diesel SCR (AdBlue) systems, mainly on large SUV and V6/V8 TDI platforms.

Common applications include:

• Audi Q7 (4M) 3.0 TDI / 4.0 TDI diesel
• Audi Q8 (4M) 3.0 TDI diesel variants
• Volkswagen Touareg (CR / MLB Evo platform) 3.0 TDI diesel
• Porsche Cayenne (9YA) 3.0 TDI diesel (selected configurations)
• SCR (AdBlue) Euro 6 diesel emission systems

Fitment is strictly based on OE number matching: 4M0907807AL

OE catalog listings confirm this sensor belongs to the MLB Evo NOx sensor family used across Audi / VW / Porsche shared diesel architecture.

Technical Description

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

It is part of the SCR (Selective Catalytic Reduction) system and controls AdBlue dosing strategy to reduce emissions and ensure Euro 6 compliance.

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

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

• 4M0907807AL
• Related OE family variants: 4M0907807G / 4M0907807AF (platform-dependent revisions)

FAQ

Which vehicles use this NOx sensor?

It is mainly used on Audi Q7/Q8, Volkswagen Touareg, and some Porsche Cayenne diesel models built on the MLB Evo platform.

Is this sensor interchangeable with similar OE numbers?

No. Even small suffix differences (AL / G / AF variants) can indicate different calibration, software matching, or sensor position (upstream/downstream).

Why do Porsche, Audi, and Volkswagen all appear in one part?

Because this is a Volkswagen Group (VAG) shared diesel SCR platform part used across multiple brands with the same emissions architecture.

Is this a diesel or gasoline sensor?

This is a diesel NOx sensor used in SCR (AdBlue) systems, not for gasoline engines.