Fitment

Based on OE catalog cross-reference data, 4N0907807F / 4N0907807 belongs to the Volkswagen Group MLB Evo / luxury platform emissions system family, used on newer VAG large vehicles equipped with diesel SCR (AdBlue) systems.

Common applications include:

• Audi A8 (4N platform) 3.0 TDI / 4.0 TDI diesel variants
• Audi Q8 (4M facelift / MLB Evo derivatives depending on engine)
• Audi Q7 (4M facelift diesel applications)
• Volkswagen Touareg (CR / MLB Evo platform diesel variants)
• SCR (AdBlue) exhaust aftertreatment systems

Fitment is strictly based on OE number matching: 4N0907807F / 4N0907807

OE cross-reference data confirms this sensor family is used in MLB Evo-generation diesel platforms with updated emissions control 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 VAG diesel platforms.

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

• 4N0907807F
• 4N0907807
• Related OE family (platform-dependent revisions)

FAQ

What does this NOx sensor do?

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

Which vehicles use this part?

It is commonly used in Audi A8 (4N), Q7/Q8 (MLB Evo diesel variants), and Volkswagen Touareg diesel applications depending on engine configuration.

Is this sensor vehicle-specific?

Yes. It is strictly matched by OE number. Even small suffix differences (F / G / N / R variants) can indicate different ECU calibration or mounting position.

Can similar NOx sensors be used instead?

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