need some help here,

today I jump in my 05 Gt, and the check engine light is on and will not go off. I pull over, check all the lines and hoses and everything seems all right. So, I assume its just an o2 sensor and decide to take it to the dealership the next day.

When I got home I decide to flash the computer with my 93 tune to see if it makes a difference. I hook it up and bingo, no more check engine light. Now im wondering what the heck happened? any opinions??

 

when you load the tune it erases all DTC....you are suppose to pull the code first then relash!

 

So, what do I do now?

 

nothin....wait to see if it comes back