PRODUCT TITLE
NOx Nitrogen Oxygen Sensor for Audi / VW 2.0 TDI MQB Platform 04L907805L / 04L907807S / 04L907807AC / 04L907807BF / 5WK97312 SCR Emission System Unit

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

• Audi A3 / Q2 / Q3 (2.0 TDI SCR Euro 6 MQB platform variants)
• VW Golf MK7 / MK7.5 (2.0 TDI SCR engines)
• VW Tiguan / Tiguan Allspace (2.0 TDI SCR variants)
• VW Passat B8 (2.0 TDI SCR systems depending on engine code)
• Seat Leon / Ateca / Alhambra / Sharan (SCR diesel MQB variants)
• Skoda Octavia / Superb / Kodiaq (2.0 TDI SCR systems)
• Euro 6 diesel SCR aftertreatment systems

OEM / CROSS REFERENCES

• 04L907805L
• 04L907807S
• 04L907807AC
• 04L907807BF
• 5WK97312 (Continental/VDO sensor cross-reference)
• SNS312 / SNS705 series (platform-dependent variants)

These part numbers belong to the same MQB 2.0 TDI SCR NOx sensor family, but may differ by software revision, emission calibration, or sensor position (upstream/downstream).

FUNCTION
This NOx sensor monitors nitrogen oxide levels in the exhaust system and sends real-time data to the ECU to control AdBlue dosing. It is essential for maintaining Euro 6 emissions compliance and proper SCR system operation.

FAQ
Q1: What does this NOx sensor do?
It measures NOx emissions in the exhaust and helps the ECU regulate AdBlue injection for emission reduction.

Q2: Where is it installed?
In the SCR exhaust system, usually mounted before or after the catalytic converter depending on configuration.

Q3: Symptoms of failure?

• Check engine light
• SCR / AdBlue warning messages
• NOx sensor fault codes (P2200–P229F common)
• Limp mode or reduced engine power

Q4: Are all listed part numbers interchangeable?
They are part of the same sensor family, but compatibility depends on engine code, ECU software version, and sensor position.