Fitment

Based on OE catalog cross-reference data, 4G0907807H / 5WK97211 is used in Volkswagen Group MLB platform diesel V6 TDI SCR (AdBlue) systems, mainly on Audi A6 / A7 generation vehicles.

Common applications include:

• Audi A6 (C7 / 4G chassis) 3.0 TDI diesel
• Audi A7 Sportback (4G chassis) 3.0 TDI diesel
• Audi A6 Allroad (4G platform) diesel variants
• SCR (AdBlue) emission systems (Euro 6 V6 TDI platform)

Fitment is strictly based on OE number matching: 4G0907807H / 5WK97211

OE cross-reference data confirms this sensor is part of the Continental / Vitesco NOx sensor family used across EA897 V6 TDI SCR systems.

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 regulates AdBlue injection 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.

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

• 4G0907807H
• 5WK97211
• Continental / Vitesco reference family (SNS450C equivalent in some listings)

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 A6 C7 (4G) and A7 3.0 TDI diesel models equipped with V6 EA897 engines.

Is this sensor vehicle-specific?

Yes. It is strictly matched by OE number. Even small suffix differences (H / J / K variants) can indicate different calibration or sensor position.

Can similar NOx sensors be used instead?

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