I recently bought a 2012 sel focus it was wrecked and I had to replace the entire front. got it running and a/c working when the cooling fans stopped and had all types of warning lights but motor stayed running, after i shut it down it wouldn't restart but I got engine malfunction waring. the only code I can get is 0850 and the display doesn't show the correct gear selection on the dash. I jumped the starter relay and it cranks. I found a shorted wire on the a/c compressor, fixed it and swapped out tcu ecu, no change. how do you clear the engine malfunction, any idea what could be wrong. or do I have to bite the bullet and take it to the dealer?