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

• BMW 1 Series (F20 / F21 diesel SCR variants)
• BMW 3 Series (F30 / F31 diesel SCR variants)
• BMW 5 Series (F10 / F11 diesel SCR variants)
• BMW X1 / X3 / X4 diesel models (selected Euro 5 / Euro 6 applications)
• Mini diesel models with SCR systems (select configurations)

Using reference numbers:

• 850972101 (BMW OEM reference)
• 5WK96640D (Continental/Bosch sensor family cross-reference)
• SNP124Q (aftermarket/sensor coding reference)

This NOx sensor is part of the SCR exhaust aftertreatment system, responsible for monitoring NOx emissions and regulating AdBlue dosing.

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 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 engine setup.

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 850972101 the same as 5WK96640D?
A4: Yes, 850972101 is the BMW OEM number and 5WK96640D is the supplier cross-reference for the same NOx sensor unit.