Last week I had the check engine light come on and saw error 420, cat
>efficiency low, started thinking it was time to replace the
>converters but a few days later, the light is off. Humm! Did note
>in the owners manual saying light would go off if problem was due to
>loose gas filler cap.
>
>Anyone know which codes will reset if condition doesn't continue? >
>Mickey
I just had a repair done to replace a faulty knock sensor that was causing my Check Engine light to come on and then go out.
Eugene Moon
2000 Impreza 2.5RS