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

• Volkswagen Touareg (7P 3.0 TDI diesel SCR variants, 2010–2018)
• Porsche Cayenne (92A / 958 3.0 TDI diesel SCR variants, 2011–2019)
• Select Audi Q7 3.0 TDI (related SCR platform compatibility depending on system version)
• VW Group Euro 5 / Euro 6 diesel SCR platforms

Using reference numbers:

• 059907807AA (OEM VAG part number)
• SNS453 (sensor family designation)
• 5WK9 series SCR NOx sensor equivalent platform (depending on supplier revision)

This NOx sensor is part of the exhaust aftertreatment system, used to measure nitrogen oxide levels and regulate AdBlue/DEF injection for emissions compliance.

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) levels in the exhaust system and sends 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 upstream or downstream of 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 059907807AA interchangeable across VW and Porsche?
A4: Yes, it is a shared Volkswagen Group SCR sensor used across Touareg, Cayenne, and related platforms, but exact fitment depends on ECU calibration and engine version.