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

• Audi Q7 (4L 3.0 TDI diesel SCR variants 2009–2015)
• Volkswagen Touareg (7L / 7P 3.0 TDI diesel SCR variants 2009–2016 depending on engine code)
• Porsche Cayenne diesel (shared VW Group SCR platform variants depending on configuration)
• Euro 5 / early Euro 6 diesel SCR aftertreatment systems

Using reference numbers:

• 059907807Q / 059907807R / 059907807S (OEM VAG part variants)
• 5WK96685A (Continental/VDO sensor cross-reference)
• SCR NOx sensor family used across VW Group 3.0 TDI V6 platforms

These variants typically represent front / rear / upstream / downstream NOx sensor positions, so correct placement must match ECU configuration.

IMPORTANT NOTE (FITMENT CRITICAL)
Even though these part numbers look similar, they are often position-specific sensors (pre-cat / post-cat). Mixing them can trigger:

• SCR fault codes
• AdBlue system errors
• Emissions warning lights

Always confirm by VIN or original sensor part number before replacement.

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 injection and reduce emissions.

Q2: Where is it installed?
A2: In the SCR exhaust system (before or after catalytic converter depending on variant).

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

Q4: Are Q / R / S versions interchangeable?
A4: Not always. They are closely related revisions but often differ by sensor position or software calibration requirement.