It just came on and i don't know why? Guess to the dealership I go.

 

Could be a simple as you changed the brand of gas you are using, or cross-threading the gas cap when putting it back on... or it could be something else. How's the car running?

 

I ran my LS1 for two years resetting the check engine light every single week only to have it come back on again. It kept returning a 25 Code which my mechanic said was vague in that it could be anything associated with the emissions.

Finally my mechanic told me to run a couple of tankfuls of Techtron added to the gas and it hasn't shown it's ugly face since (5,000 miles ago)

 

i have been runnin 93 octane in it since i got. I have been using Shell V-Power and BP 93 Octane, and the car is running just as it always has.

 

Same Problem, But i was running 89 when i would be on the highway a lot now its coming on and off since im running only 93