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

• VW Golf / Tiguan / Passat (2.0 TDI SCR Euro 6 MQB platform)
• Audi A3 / Q3 (2.0 TDI SCR variants depending on engine code)
• VW Sharan / Alhambra (SCR diesel variants)
• Skoda Octavia / Superb / Kodiaq (2.0 TDI SCR systems)
• Seat Leon / Ateca / Alhambra (SCR diesel variants)
• Other VW Group MQB/MLB 2.0 TDI Euro 6 diesel platforms

OEM / CROSS REFERENCES

• 04L907805L
• 04L907807BF
• 04L907807AC
• 04L907807S
• 5WK97312 (Continental/VDO sensor cross-reference)
• SNS705 / SNS0751C family (platform-dependent variants)

These part numbers belong to the same SCR NOx sensor family, but may represent different software revisions or sensor positions (upstream/downstream).

FUNCTION
This NOx sensor is a key part of the SCR exhaust aftertreatment system. It measures nitrogen oxide (NOx) levels in the exhaust and sends data to the ECU to control AdBlue (DEF) injection, ensuring Euro 6 emissions compliance and optimal catalyst efficiency.

FAQ
Q1: What does this NOx sensor do?
It monitors NOx emissions in the exhaust and helps the ECU adjust AdBlue dosing to reduce harmful gases.

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

Q3: What are symptoms of failure?

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

Q4: Are all listed part numbers interchangeable?
They are from the same sensor family, but must match ECU calibration and sensor position, so VIN verification is required before replacement.