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

• BMW X5 (E70 / F15 diesel SCR variants)
• BMW X6 (E71 / F16 diesel SCR variants)
• BMW 5 Series (selected diesel Euro 5 / Euro 6 models)
• Audi Q7 3.0 TDI (4L / early SCR systems)
• Volkswagen Touareg 3.0 TDI (7P platform)
• Porsche Cayenne 3.0 diesel (SCR-equipped variants)

Using reference numbers:

• 059907807D (VW/Audi OEM cross-reference)
• 5WK96623B (Continental/Bosch sensor family)
• 5WK9 6623B
• SNS-type SCR NOx sensor variant (depending on supplier coding)

This sensor is used in SCR exhaust aftertreatment systems to monitor NOx emissions and control AdBlue/DEF injection.

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) levels in the exhaust and sends data to the ECU to regulate AdBlue injection and reduce emissions.

Q2: Where is it installed?
A2: It is installed in the SCR exhaust system, usually 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: Are 5WK96623B and 059907807D interchangeable?
A4: Yes, 059907807D is the OEM/VAG reference and 5WK96623B is the sensor manufacturer cross-reference for the same NOx sensor unit.