What else could cause this problem other than the sensors and the relays

Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops Seems like you need a new set of eyes on your concern. This isn't working so far! Diagnostic trouble codes are available to be retrieved, and should be reviewed as they are clues to where to look for trouble. It would be speculation without that data to know what to do next. Seek local guidance - good luck!