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.
It will start sumtimes and then others it want
I ordered a new key from BMW but they were unable to program it (and of course they want me to make a costly service appointment). Could the transmitter receiver be bad? Is there a fuse for said item?
Any insight would be greatly appreciated.
car disp[lay keeps going on and off also does the the passenger light oring
It was in a accident but it was just repaired its condensation in the light fixture
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
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