[Gle8]

Hi all. Any help with this would be appreciated.

Car:

2007 Z4Mc.
-74k miles.
-Euro headers (o2 relocated)
-BMS Exhaust
-ESS tune.

Symptoms:

SES Light

-2FdA: Crank case ventilation, system check
-2CFA: Throttle value potentiometer 2
-2d09: Throttle value
-2CFB: Throttle value adaption value
-2A1C: Tank filling level, plausibility
-2C7F: Aftercat o2 sensor trim control, bank 2
-2C2B: Precat o2 sensor systemcheck, bank 1

Additional Notes:

-Battery replaced by dealer 3 weeks ago
-About 60 miles prior to SES, car stumbled at idle, once, briefly. It is usually rock solid at around 900prm, but in this instance, at a stoplight, it plunged briefly to about 500 for no apparent reason. Ran fine from then on.
-About 20 miles prior to SES, I filled the tank. I am sure that the cap was put back on securely


I cleared the codes yesterday. Drove for about 10 miles today, no SES. About 4 hours later, drove another 10 miles and SES re-appeared just before I got home. Ran the codes again, and the only one present is "2FdA: Crank case ventilation, system check". Seems to be driving fine.


Any thoughts? I'd like to have an idea before I head to the shop. Thanks in advance