[koziol]

BMW 650i errors2A8D – Exhaust VANOS, adaptation stop 22A91 - Exhaust camshaft 2, tooth offset to crankshaft Engine shakes on start up for few seconds and then back to normal idle fine engine perform ok when running. 

Fallow Service Information bulletin   SI B12 08 15 Engine oil, disturbed reset was performed did not help. Battery disconnected for one hour than reset performed again still no success. Any advice will be appreciated

[javorkrustev]

You have few options: Vanos solenoid valve, Ex camshaft sensor, wrong timing, faulty chain tensioner, Vanos unit and off course wiring and ECU. Start with component exchange, exchange vanos solenoid valves, clear errors start and read again. Тhen the camshaft sensor and so until the error is moved. If error stays at the same place, must open and check timing.