the other week the check engine light came on in my tacoma when I was 600kms from home. I drove it home, and made an appointment at the dealer, but I had to wait until today to get an appointment. Well, the other day I was checking everyything under the hood to make sure it was good, and checked the battery posts to make sure that was all good...but it reset my computer, and the dealership now can't tell why the light came on. My question is this...if there is a problem, should my check engine light come on again? If it doesn't should I not be concerned? Any help is appreciated.