CEL Question again.

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.

Thanks.

 

There should be a 'history' stored within the computer. The dealership should be able to find the code hidden in the memory.

 

They checked it out today, and couldn't find anything. I wonder if it could be attributed to the gas I filled my truck up with prior to my road trip...it was Costco gas which I've never used. I had read on other forums about their gas being not so good, and setting off peoples CEL?! I'm just hesitant to drive it in case I F it up...

 

Ya think? I guess I will do that then. If the light comes on, then I'll just take it in... was just paranoid that if I accidently reset it, and it didn't come back on, I may harm the truck. Thanks.