FITMENT
Compatible with Volkswagen Group diesel vehicles equipped with SCR (Selective Catalytic Reduction) AdBlue emission systems requiring NOx monitoring.
Common applications include:

• Audi A4 (B8 / 8K platform diesel SCR variants)
• Audi A5 (diesel SCR variants)
• Audi S4 / S5 (diesel SCR-equipped models depending on engine)
• VW Passat (B7 / B8 diesel SCR variants)
• VW Sharan (diesel SCR variants 2010+)
• Shared VW Group 2.0 TDI / 3.0 TDI SCR platforms

Using reference numbers:

• 8K0907807E (OEM VAG part number)
• 5WK96688 (Continental/VDO sensor cross-reference)
• Common SCR NOx sensor family used across Audi/VW/Seat/Skoda systems

This sensor is part of the exhaust aftertreatment system and monitors nitrogen oxide (NOx) levels to control AdBlue dosing for Euro 5 / Euro 6 compliance.

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) in the exhaust system and sends data to the ECU to regulate AdBlue/DEF injection and reduce emissions.

Q2: Where is it installed?
A2: It is installed in the SCR exhaust system, typically before or after the catalytic converter depending on vehicle configuration.

Q3: What are symptoms of failure?
A3: Check engine light, SCR/AdBlue warnings, NOx sensor fault codes, reduced engine power, or limp mode activation.

Q4: Is 8K0907807E interchangeable with 5WK96688?
A4: Yes, 8K0907807E is the OEM Audi/VW reference and 5WK96688 is the supplier cross-reference for the same NOx sensor unit (final compatibility depends on ECU/software version).