Hey guys this is a wonderful forum! Anyway i just picked up a 06 H3 base with a 5 speed manual tranny and 32k miles..The car is in excellent condition and runs excellent..I recently filled the tank with 91 octane sunoco gas and than a day afetr i bought a bottle of Techron fuel injector cleaner.I know your supposed to wait till the tank is empty before adding the cleaner and than fill it up..So anyway i put the injector cleaner to a already full tank of gas.SO this afternoon i went outside to start my rig to warm her up a little.. i came back and there it was the dreaded check engine light..Car wasnt sluggish and ran excellent.. could this mishap with the feul injector cleaner caused this?? any thought would be appreciated..just hope it not the dreaded head problem!!!!