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How to reset service engine light

1610 Views 5 Replies 6 Participants Last post by  kids-at-711
I have a 1990 gmc 4x4 it has a 350 engine and I need to reset the service engine light can some tell me how tp reset it?
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Put black electrical tape over it.
You can "reset" it by disconnecting the battery, but like Ravine said, it's on for a reason.
It's probably your o2 sensor that's shot, have you tried scanning it to figure out what the problem is?


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Just need a paperclip and the ability to count.
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