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

• VW Passat (2.0 TDI SCR variants, 2014+)
• VW Passat Alltrack (2.0 TDI SCR 4Motion CUAA engine)
• VW Sharan (SCR diesel variants depending on engine code)
• Skoda Superb / Octavia (related SCR 2.0 TDI platforms)
• Seat Alhambra / Leon (SCR diesel variants depending on ECU)
• Euro 5 / Euro 6 VW Group MQB diesel SCR systems

Using reference numbers:

• 03N907807B (OEM VAG part number)
• 5WK97252 (Continental/VDO sensor cross-reference)
• 70680067 / CSN73B80AS / DN6N160014B (aftermarket equivalents depending on supplier)

FUNCTION
This NOx sensor is part of the SCR exhaust aftertreatment system. It measures nitrogen oxide (NOx) levels in exhaust gases and sends data to the ECU to regulate AdBlue (DEF) injection, ensuring emissions compliance and optimal catalyst performance.

FAQ
Q1: What does this NOx sensor do?
It monitors NOx emissions in the exhaust and helps control AdBlue dosing in the SCR system.

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

Q3: Symptoms of failure?

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

Q4: Are 03N907807B and 5WK97252 the same?
Yes. 03N907807B is the OEM VW/Audi/Skoda/Seat number, and 5WK97252 is the Continental/VDO cross-reference.