2005 BMW 645Ci Questions

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It recently started happening. Doesnt do it all the time. Also i recently purchased the car 3 months ago and it does not have the original size battery but it has been running strong.
car disp[lay keeps going on and off also does the the passenger light oring
2 years ago the dealership replaced condensor, compressor etc.. A/C worked good for 2 years althought havent used it accessively in the past summer seasons. I recently added R134A , autozone. 44dollar can w/pressure gauge.. The a/c came on cold for only two days, then started blowing hot air again.checked climate settings and its ok
I have checked the fuses and disconnected the battery several times but the top will not go down. The navigation screen says "top not locked". We used the allen wrench and manually tried to lock/unlock to no avail.
I was told that they needed to put an expandable pipe in ?
It won't pass emissions so I need to LOCATE/REPAIR to 3 bad sensors.
Turn over??
Listed as runs great
a allen wrench but i still get error message , Top does not go up or down , Is there a way to reset it
last year weird messages would pop up steering stability, a picture of window, radio would like pop and turn off. Dealer said it was battery, then alternator, then battery wasnt registerd. I couldnt afford anymore so I drive it. Parked for winter, and just drove again, got tramsmission warniing, then window picture, then radio popped then it came back on. All messages go away and never come back on after I turn car on. Delaer says its a main computer, thats hard to get to and costs about 3000 totoal to repair and reset all things...I dont trust anyone anymore. I didint know this car was so expensive to fix, and now think I have to sell> I feel screwed by dealer...
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