My 03 X5 with 48K on it had the SES light come on over the weekend. I know it indicates an emission related problem and most likely points to O2 sensor but it's too early since O2 sensors does not need replacement unitl 100K. I have 105K on my 00 3 series and on the original O2 sensors and no problems. Anyone has any suggestions?
Thanks,

no, it does not most likely point to o2 sensors.

there's a hundred things that can turn on the check engine light. you're pissing in the wind until you have someone with a scan tool read the codes.