Check engine light is emissions.
Checking the codes in the computer would be a good idea. Although I think it is a by-prouct of the alternater not adequetly charging. The volt meter fluctuation is the biggest concern at this point. THe alternater has to be test when the symptoms are present.
The O2 sensor has to do with fuel/air ratio. I don't believe that this one illuminates base on mileage for an o2 change.
Wednesday, March 5th, 2008 AT 5:52 AM