Fault code 272c and 272d adaption additive, regulation limit reached bank # XXXXX
274e misfire detection, check sum
27d5 failure within the idle speed control.
Faults 272c,272d,274e are most commonly set due to bad crankcase vent valves, which there is a recall on these. Depending on the production date of your vehicle your vehicle might fall under the recall.
And if it does not this repair you can perform yourself.
Fault 27d5 can be set due to these fault codes for some reason, but 1st you will need to eliminate the other fault codes and see if this fault returns or not.
Defective Positive Crankcase Ventilation (PCV) valve from torn
membrane caused by chemical reaction of carbonyl compounds
(acetic and formic acid) in PCV gas stream. DTCs stored in ECM
and MIL illumination lead owner to seek repair. The damaged
membrane lets un-metered air into the intake system which drifts
the air/fuel ratio out of specified range so exhaust emission
standards. could be exceeded.
Remedy: BMW implemented a recall. An improved silicone
material is used in the PCV valve for production and repair kits.
The crankcase ventilation valves are replaced on both cylinder
banks of the affected vehicles using improved parts.
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