Fitment

Confirmed OE application based on OEM catalog listings:

• Audi A6 (4G / C7 platform) diesel models
• Audi A7 (4G platform) diesel models
• Volkswagen Group diesel SCR (AdBlue) emission systems
• Vehicles using VAG 4G-series exhaust aftertreatment architecture

Fitment is strictly based on OE number matching: 4G0907807T

Technical Description

This NOx sensor is used in diesel exhaust aftertreatment systems to measure nitrogen oxide (NOx) concentration in exhaust gases.

It transmits real-time data to the ECU to control SCR (Selective Catalytic Reduction) dosing strategy and maintain emission compliance in diesel vehicles equipped with AdBlue systems.

The sensor is part of the emissions monitoring system and communicates with the engine control unit for NOx reduction efficiency control.

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

• 4G0907807T

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. It is strictly matched by OE number. Even small suffix differences may indicate a different revision or calibration.

Can similar NOx sensors be used instead?

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

What system is it used in?

It is used in Volkswagen Group diesel SCR (AdBlue) emission systems, commonly on 4G platform vehicles such as Audi A6/A7 diesel applications.