how to reset engine maintenance light
maintenance light on 2005 BMW 745i
press a buton on cluster,hold 20-30sec, dan u se list on left sait of cluster,chuse wotever you nided to reset by presing a youower buton on signal light swich,dan you see right sait of cluster and press cluster butonand hold ,you can resest all lights ,brakes,filters,alll
Remove ground from battery.Wait 10-20 seconds.Put back the ground on battery.That will clear the code in the cars conputer.
If you tried disconnecting the battery, already which more than likely did not work and hopefully did not cause the vehicle to loose the radio code, the only way to get a service light off a BMW is to take it to an authorized BMW shop.