I started my 2003 F250 Ford V10 eng with 105K miles. One owner, looks new. The check eng light came on and stayed on. I took it into the Ford place here in Yuma and 3 hrs later they said I need a new ...
Computer boards in vehicles are expensive and you have to get them installed by the dealer. The one that controls my remotes went out (that's all it does is the remote) - $600 to replace. I just unlock the doors with the key now.
Personally, I'd still rather replace the main board in mine for $700 than buy a new vehicle for $40K.