W203 2.2 90kw no crank no pre heating indicator
I bought w203 2.2 90kw 2005 car year ago. It had after market alarm system. One day i frogot little tablet that without it i can't drive the car. I drove like 1 km and beeping noises came and car stopped. I bought back that tablet and everything looked ok and i continued my trip. After few days i stopped turned the engine off came back after few minutes and o couldnt start the car again. Same thing as before. No pre heating indicator, no noises from fuel pump. I waited for a while and it started and worked perfectly. I thought it was an after market alarm system problem, so i took it out. I did not leave any hanging wires or smth like that everything looked okay took everything out. After few days it happened again no pre heating indicator no fuel pump sounds but i also got srs fault on dash. I couldnt start the car for whole day. Next day it started perfectly. It happens now randomly. Sometimes i can start a car after few minutes sometimes after few hours. Sometimes i get srs error when i cant start. Sometimes when i start the car i get esp fault and alternator fault, but then it dissapears.
I checked 52 fuse, relays, nothing looked bad. I noticed that there is a hole between ecu and interior im thinking is it possible that when i blow heat to my legs, it also blows on ecu and it gets farm and fails? And i need some time to cool it off? I have no idea what else to check. Saw few threads about similar problem but did not found a solution.
Thank you very much for replays.


