BMW 550i Questions

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When i back up my sensors dont work
I think its my oil pressure control valve
When I push the call button I can't hear the voice commands,or the navigation voice.
Controller knob will select through all functions but every time I select a function the Control Display defaults to a navigational screen. The satellite radio stays on only one channel. Is there some trick to reset this system without having to take it to a dealer, or is this a component failure?
I have 95K miles on my recently purchased 550i. The car is very sound & no problems. High mileage will result in future repairs. I already had to change daylight lamps with corroded cables.

Just preparing for upcoming repairs that may be covered by the x warranty.
Valve seals reported as bad and needing replacement by local dealership. Told $6000 to repair. Alternative costs and repair Locations?
master cylinder and booster were replaced and brakes bled, car drives about 3-4 miles and then the brakes start to slowly apply until they lock up, turn car off for 2 minutes and brakes reset/let go and car can drive for 3-4 miles until same problem occurs.
I bought a 2006 bmw 550i and its saying (tranny malfunction) and its in safe mode. for me to put the car in drive I have to use the shift lock method and when I do that the car jerks forward if in drive and jerks back if its put in reverse. will that be the reason why ? or is it just the tranny is going ?
the common response is the valve guides, a known problem. However, it does not burn upon starting, even when revved, it does not burn when accelerating, even when really pushing it. It will, start burning when the engine is warm and when it has been idling for at least 3 minutes. Then, big plume of blue smoke, which goes away after accelerating. And yes, the car has 101,000 miles. Oh, just got the oil changed and only added a half a quart between changes....about 8000 miles. Any ideas?
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