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International Automotive Technicians Network
Re: GM: Code 42
Posted to Technical Discussion Forum on 12/6/1997

Hi Scott

I have used numerous unconventional fixes for "false 42s" on 2.5 L engines. These techniques would only be neccessary if the module has been replaced (with no joy) and you are CERTAIN of EST, BYPASS, REF, and REF LOW circuit/connection integrity. I ... Login to read more.