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

• Audi A6 (C7 / C8 2.0 TDI SCR variants depending on engine code)
• Audi A4 / A5 (selected 2.0 TDI MQB/MLB SCR systems)
• VW Golf / Passat / Tiguan (2.0 TDI SCR Euro 6 variants)
• Seat Alhambra / Sharan (SCR diesel variants depending on model year)
• Skoda Superb / Kodiaq / Octavia (SCR diesel variants)
• Euro 6 diesel SCR aftertreatment systems

Using reference numbers:

• 04L907805EF (OEM VAG part number)
• SNS705C (Continental/VDO sensor family cross-reference)
• A2C19776200-02 (alternative supplier reference)
• 5WK9 6688A / related SCR NOx sensor family

This sensor is part of the exhaust aftertreatment system that measures nitrogen oxide (NOx) levels and ensures correct 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 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 warnings, NOx sensor fault codes, reduced engine power, or limp mode activation.

Q4: Is 04L907805EF interchangeable with SNS705C?
A4: Yes, 04L907805EF is the OEM VAG reference and SNS705C is the supplier cross-reference for the same NOx sensor unit.