Question about 1999 Buick Century

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HOw do you clear the Diagnostic Codes

I had a diagnostinc done on my 2001 Biuck Centry, came back with the speed sensor, which is the same thing they we got when we put the reader on it. But now we need to clear the codes, to put the reader back on it, to make sure what we fixed was what was throwing the codes. We unhooked the battery for about an hour, took the fuses out, we are scratching our heads on this one. How do you clear the codes??? please advise

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  • thomaslaurie Apr 25, 2010

    We did that. unhooked the whole batteery, my thought is that there it is holding the memory somewhere.

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U mite disconnect the positive battery cable,,for 5 minuets,,,but u will have to reprogram your radio & clock,,,,

Posted on Apr 25, 2010

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Disconnect the PCM harness connector(s).
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