FITMENT:
Compatible with BMW 328d xDrive and BMW X5 models (2009–2017) with 2.0L and 3.0L diesel engines.
OEM reference numbers: 5WK96697B, 857646901.
Rear (downstream) NOx sensor used in SCR emission system for exhaust aftertreatment monitoring.
Installed after catalytic converter in diesel exhaust system.
Fitment must be confirmed by OEM part number and emission system configuration before installation.

FAQ:

Q1: How do I confirm compatibility?
A1: Match OEM numbers 5WK96697B or 857646901 with your original sensor and verify connector type and wiring length.

Q2: Where is this NOx sensor installed?
A2: It is installed in the rear position after the SCR catalytic converter in the exhaust system.

Q3: What are common failure symptoms?
A3: Engine warning light, SCR system fault, incorrect NOx readings, or reduced engine performance.

Q4: Is this compatible with both 328d and X5?
A4: Yes, it is used across BMW diesel platforms including 328d xDrive and X5 diesel variants depending on emission configuration.

Q5: Does replacement require programming?
A5: Some vehicles require system reset or diagnostic adaptation after installation.