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 / B7 diesel SCR variants 2007–2012 depending on engine)
• SEAT Alhambra (2010–2022 diesel SCR variants)
• VW Sharan (2010–2019 diesel SCR variants)
• Shared VW Group 2.0 TDI / 2.0 SCR diesel platforms
• Euro 5 / Euro 6 SCR systems depending on calibration

Using reference numbers:

• 5WK96623B (Continental/VDO sensor family cross-reference)
• 059907807D (OEM VAG part number)
• Common SCR NOx sensor system used across VW/Audi/Seat/Skoda platforms

This sensor is part of the exhaust aftertreatment system that monitors nitrogen oxide (NOx) levels and ensures correct AdBlue dosing.

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) in the exhaust system and sends real-time data to the ECU to control AdBlue 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 system warnings, NOx sensor fault codes, reduced engine power, or limp mode activation.

Q4: Are 5WK96623B and 059907807D interchangeable?
A4: Yes, 059907807D is the OEM VAG reference and 5WK96623B is the supplier cross-reference for the same NOx sensor unit (application must still match ECU version).