FITMENT:
Compatible with BMW diesel vehicles equipped with SCR emission systems, including:
F22 / F23 (2 Series), 218d / 220d / 225d models, and E71 X6 diesel applications depending on emission configuration.

OEM reference number: 858984401.
Used in diesel exhaust aftertreatment system for NOx monitoring (AdBlue/DEF SCR system).
Installed in exhaust system (rear/downstream position after SCR catalyst).
Fitment must be confirmed by OEM part number and emission system layout before installation.

FAQ:

Q1: How do I confirm compatibility?
A1: Match OEM number 858984401 with your original NOx sensor and verify connector type, cable length, and SCR system configuration.

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

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

Q4: Is this compatible with all listed BMW models?
A4: No, compatibility depends on engine variant and emission system configuration. OEM number must be matched exactly.

Q5: Does replacement require programming?
A5: Some BMW diesel models require diagnostic reset or SCR adaptation after installation.