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Re: 98 GMC T15 jimmy 4.3W code P0154
Posted to Technical Discussion Forum on 3/1/2004

William,

P0154 sets when the O2 sensor voltage is between 351-551 mV for more than sixty seconds. Some of the possible causes is an open circuit or a short to voltage in the HO2 sensor signal or low circuits, a problem in the HO2 sensor heater or heater circ... Login to read more.