If you think you have fixed your problem. Then take off the battery
terminals and short them together ( so that the battery isn't hooked up
anymore at all.. and turn your lights on.. Let it sit for about 5 minutes or
so. This will completely drain your cars computer and will reset your error
message.. Over the next 50km or so, if there is still an error.. the light
will come back on. I hope this helps.
I had my light come on after I put a cold air intake on my focus. Turned out
my MAP sensor was saying my car wasn't getting enough air. but my O2 sensor
said I needed more fuel for the air that I had.. so my car was fighting with
itself. Anyway, a mechanic told me that was how I was supposed to clear the
error messages from my car
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