I bough a hit 2.7 and have the engine all put together. It turns over great but the front end is still off so none of those sensors are hooked up. Is it possible for it still to fire up or do all those need to be hooked up? Is there a way to bypass these? I got my vag working and I can talk to most things except I get no response from the ENGINE module 1. Also the fault codes i get on everything else is P1850 "Missing Message from ECU"

Any ideas?