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How do you clear the codes in my 1994 GMC Sierra

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You can try to remove the negative battery cable for about 20 minutes and see if that will do it or if you can find a scanner with the correct connection to the down link under the dash you can do it with a scanner. The down links were not standardized until 1996 and after so you probably will not have any luck with that.

Posted on May 12, 2017

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Posted on Jan 02, 2017

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