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P0143 Diagnostic Trouble Code Discussion for October 2007

Heated Oxygen Sensor (Bank 1 Sensor 3) Circuit Low Voltage

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Trouble Ticket Help Requests for DTC P0143
Help Request Posted
1996 GMC C1500 Sierra SL 4.3L Misfire, MIL Lamp on VIN: 1GTEC14W9T
P0143: Heated Oxygen Sensor (Bank 1 Sensor 3) Circuit Low Voltage. Truck came with complaint of Check Engine Light comes on And Missfires. Road tested w/scan tool. No missfire & light not on. Bank 1 sensor 1 is switching fine but freeze frame showed Bank 1 Sensors 2 & 3 at 99%. Sensor 3 is before cat & 2 after cat...
October 09, 2007