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

• Audi Q3 (2.0 TDI SCR variants depending on engine code)
• VW Tiguan (2.0 TDI SCR Euro 6 MQB platform models)
• VW Sharan (2.0 TDI SCR diesel variants)
• SEAT Alhambra (2.0 TDI SCR diesel variants)
• Skoda Kodiaq / Octavia / Superb (related MQB 2.0 TDI SCR systems)
• Euro 6 2.0 TDI diesel SCR aftertreatment systems

Using reference numbers:

• 04L907805L (OEM VAG part number)
• 5WK97233 (Continental/VDO sensor cross-reference)
• SCR NOx sensor family used in MQB platform 2.0 TDI engines

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

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) levels in the exhaust 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 04L907805L interchangeable with 5WK97233?
A4: Yes, 04L907805L is the OEM VAG reference and 5WK97233 is the supplier cross-reference for the same NOx sensor unit, but exact fitment depends on engine code and ECU calibration.