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Home >> Geo >> 1992 >> Prizm Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> Clearing Codes

Clearing Codes

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Turn ignition switch to OFF position. Disconnect negative battery cable, or remove STOP fuse in fuse block, for at least 30 seconds. ECM fault code memory is now clear. If negative battery terminal is removed to clear ECM memory, clock and radio memory will also be erased.