Hi,

My O2 sensor is broken again. The probe is broken inside (rattling when shaking). It is a BMW part, no. 11781735710 that I got from ECS tuning. I had it installed on Dec. 30, 2014 and 3 months later, the CEL light came on again, showing the O2 sensor codes (1221, 1222). Removing the sensor out of the car it was evident that it was broken inside the probe. I ordered a replacement and will send back to broken one. Beside that there was nothing to diagnose a problem upfront from the probe appearance, it was not carbon fooled, neither coolant fooled. Otherwise the car runs great, not leaking coolant, neither oil. Intake vacuum is steady 24’’ of vacuum.

http://www.bimmernut.com/forum/showt...ot-fluctuating

On the RealOEM parts listing, it is showing that the oxygen sensor part. 11781735710 as ENDED, See SI 110792523; The new part no. is 11781735680.

Can anyone help me find what is the SI 110792523 means please.
I can’t find it searching of my TIS or Googling it.

Thanks!
Alex