Fitment

Fits for:

• Audi Q7 (4M)
• Audi Q8 (4M)
• Volkswagen Touareg (CR)
• Porsche Cayenne (9YA / E3) diesel SCR variants (platform shared systems)
• Engine: VAG 3.0 TDI / 4.0 TDI diesel engines with SCR (AdBlue / DEF) system
• Position: Exhaust NOx sensor (SCR inlet or outlet depending on configuration)
• OE / Cross References: 4M0907807AF / 4M0 907 807 AF / SNS711A / A2C11999500-02 / 5WK97494 / 8W0907807E / 4M0907807AK / 4M0907807AQ / NOx sensor family

FAQ

Q1: Are 4M0907807AF and SNS711A the same sensor?
A1: Yes. 4M0907807AF is the Volkswagen/Audi OE number, and SNS711A is the corresponding NOx sensor reference used in VAG SCR diesel systems.

Q2: What vehicles use this sensor?
A2: It is commonly used on Audi Q7, Q8, Volkswagen Touareg, and Porsche Cayenne diesel models equipped with Euro 6 SCR (AdBlue) systems.

Q3: Is this inlet or outlet sensor?
A3: Depending on exhaust layout, it can be used as SCR inlet or outlet NOx sensor. Many VAG systems use paired sensors with similar designs.

Q4: What does this sensor do?
A4: It measures nitrogen oxide (NOx) levels in exhaust gases and sends data to the ECU, which controls AdBlue dosing to reduce emissions and maintain SCR efficiency.