Howdy All,
Im the proud owner of a 2002 Protege5 with 195,4XX miles on it.
My gas mileage is horrible. Ive changed my O2s tunes up and all that. The car doesnt seem to be runnign rich so I know my CEL (p0421) light/code isnt being caused by the cat at least I hope.
I want to change my...