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Bad Oxygen Sensor Wiring, P0300,P0171,P0134,P1133
Posted to Technical Tips Forum on 7/7/2003 1 Reply

Just thought I would pass this along. 98 Chevy Blazer 4.3l, customer complaint was Check Engine light with the vehicle running rough at idle.

Pulled it in and scanned for codes, in this order they failed.

P0171,P0134,P1133,P0300. The misfire code was last,... Login to read more.

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