1995 BMW 840Ci Questions

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The overheating was not resolved with water/coolant added. It now has set up 5 yrs plus. There were no recalls for issues of water/gasoline..that is any type of condensation.

I have a very low mileage 840CI (14,500 Miles). I believe I tripped something replacing both batteries in the trunk as the auto transmission will not go into forward or reverse.
Any way I can reset anything that I might have tripped?? Also, got Transmission Fail-Safe indication, but not getting that anymore. Radio will not accept code to reset either.

The symptoms are:
The first time I was waiting for a green traffic light when suddenly the car wouldn't go. I looked at the OBC and the trans fail message was there. I pulled out the key and start the car again has if nothing happened. The second time the car did started running, but very very weak, as if it was running in the first gear. Same thing; I pulled over, pull out the key and started the car again as if nothing happened.
I took my 840 to the mechanic to perform a scanning after the OBC showed the message and the diagnosis was:

042($2A) Speed signal n-ab

I got the Speedometer Sensor - Located in differential

Part # : 62 16 8 357 020

will this solve the problem or should I'd be looking for something else?
Any help will be appreciated.

when i try to crank my 840ci it stalls there is gas in the tank when i hit the bottom of the tank it had started but then i turned it off it started stalling a again, starter fluid was used, still not cranking could it be my fuel pump if so which one and are there two fuel pumps on this car