Mercedes-Benz E420 Questions

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Key was lost. Steering lock was removed so car could be moved. Ignition in position 2, SRS light goes out for 3 seconds, comes back on. Engine turns but won't start. Key sensor (plastic ring at end of ignition in dash) was unplugged. Key I purchased from Dealership. Works door locks, ignition & alarm system is functional. I don't know where to start. I was injured last year & am on disability so funding for this project is limited. HHHEEEELLLPPPPP
Can we do it ourselves?
What is the cost?
What happens if we don't fix it.
Also low fuel indicator light is flashing.
Was working at about half speed for awhile and just quit working all together.
Fan motor was blowing at low speed for about a year.
Bulb replaced, but problem still there
i also replaced the remote/key battery with no result. Is there a reset or procedure that I do not know about?
Compresser cycles AC charged, blows cool at first then blows room temperture. Used 1 34A with lubercant and sealent to recharge system. Compressor cylces hard. Stumped?
It happened all of a sudden. Start car put in reverse back out put it in drive and wont go from first to second third or fourth even manually. Just reverse and first.

I have E420 AMG Sport 1997. The AC compressor doesn't start and EC light is on. I can't turn it off. I read as long as it is on, compressor doesn't start. I added gas and there is no leak but the EC light is still on. Any help will be appreciated.
Have an 1994 E320 as well and the doors do lock as I accelerate. My E420 does not. The central locking works when the doors are locked using the key.
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