alright, my check engine light came on and i had it checked out by a car place. they said it was an O2 sensor. my question is, i want to do the manual way of finding the trouble codes but from all the pictures i have seen about the screw you turn, that it looks different on mine. the little plastic rectangle with writing on says something different than what i have seen. right above that hole with the screw it says idle adjustment. i was wondering if i should still do the readout even though it says that right above the hole. i have a 99 so i dont know if it will be different or not. any help would be greatly appreciated. thanks