Fitment

Based on OE catalog cross-reference data, 8R0907807Q is used in Volkswagen Group EA897 / V6 TDI diesel SCR (AdBlue) systems, mainly on Audi Q5 platform vehicles.

Common applications include:

• Audi Q5 (8R) 3.0 TDI diesel (various model years)
• Audi SQ5 (8R) 3.0 TDI diesel
• Volkswagen Touareg (7P) 3.0 V6 TDI diesel (selected configurations)
• SCR (AdBlue) diesel emission systems (Euro 5 / Euro 6 depending on engine code)

Fitment is strictly based on OE number matching: 8R0907807Q

OE catalog data confirms this part is a NOx sensor used in VAG V6 TDI SCR systems, often positioned upstream or downstream depending on exhaust layout.

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 to reduce emissions and ensure compliance with Euro standards.

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

Symptoms / Fault Codes

Common symptoms of failure include:

• Check engine light
• P2200 / P229F fault codes (system dependent)
• SCR / AdBlue system warning
• Reduced engine power (limp mode)
• Increased emissions

OE / Part Numbers

• 8R0907807Q
• 8R0907807G (closely related revision in same family)
• 8R0907807 (base family reference)

FAQ

Which vehicles use this NOx sensor?

It is mainly used on Audi Q5/SQ5 8R 3.0 TDI diesel models, with some applications on Volkswagen Touareg depending on engine configuration.

Is this sensor interchangeable with similar OE numbers?

Not reliably. Even small suffix differences (Q / G / A variants) can indicate different calibration, cable length, or sensor position (upstream/downstream).

Why do OE numbers have letters like Q or G?

The suffix indicates engineering revisions, supplier updates, or mounting differences while keeping the same base system family.

Is this a diesel or gasoline sensor?

This is a diesel NOx sensor used in SCR (AdBlue) systems only.