Question about 1994 GMC Safari

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94 gmc safari

Code 43

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  • Anonymous Mar 28, 2014

    when I change it to drive, it turn off

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Hi there HO2S BANK 1 SENSOR 3 HEATER CIRCUIT LOW . this jiberish means that its an upstream preheated oxygen switch it may need to be replaced or one of the wires could be damaged take a look there is two o2 sensors on each side the more foreward ones are upstream and the ones located towards the muffler are called downstream . first thing id do is look for a bad or melted wire on one of the upstream sensors but in capital letters is the definition for code P0043 good hunting .

Posted on Jul 19, 2008

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