To your comment: Not seeing an SES, but code reader sees fault/error codes.
My SES trip may have been related to the number of drive cycles or the miles driven with fault. Maybe both. We would need to know the Motronic algorithm. I would guess the persistence of the registered fault would be a prime candidate for the SES trigger. If the CPS is marginal, the Motonic may have been going through cycles of setting and clearing the fault.
Having a code reader with a reset capability is indispensable if you own an X5. Periodically check codes even if the SES is not on. If you get an SES, ***evaluate codes, log codes, reset codes, run engine, check codes again, drive, evaluate again, and observe. Keep note number of drive cycles and keep checking and logging. Cautiously and carefully, meaning don’t ignore anything major like engine old level warning!
If you do replace the CPS sensor(s), I would recommend OEM replacements, as it appears to me the ECU is sensitive and the CPS must be in spec. Other posts have warned about non-OEM sensors.