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Message: <blockquote data-quote="BMW2007" data-source="post: 480971" data-attributes="member: 4659">I have done the Throttle body + ICV + Manifold cleaning + replaced Oil pressure/separator valve lately, this has solved the engine vibration at idling. Test drive the car, the rpm still rebounding when pedal release for slowly dropping to rpm 1000, it will auto rebound to 1500 then slowly came down again to 1000. What could be the possible cause?The engine rpm at idling just slightly high at 850 +/-, so I asked the mechanic to lower down it to ~650 by adjusting the throttle body, however rpm rebounding issue still there. It is even worst now when the aircon kick in, the rpm will be dropped to 500 or so. Sometimes, the engine oil indication light is also On and then Off when the rpm is too low (when aircon kick in and break is pressed). Plug in the computer diagnose, the error code 25 still there (O2 sensor 1, cylinder 123), could it be O2 caused all these or something else?Any idea? thanks</blockquote>