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P0051 Diagnostic Trouble Code Discussion for April 2006

Air Fuel Sensor (Bank 2 Sensor 1) Heater Control Circuit Low Voltage

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Trouble Ticket Help Requests for DTC P0051
Help Request Posted
2003 Jeep Grand Cherokee Laredo 4.0L MIL Lamp on VIN: 1J4GX48S43
P0051: Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Circuit Low Voltage. ... light on. i checked the codes and they were a p0456, and a p0051 which is a O2 bank 2 sensor 1 heater circuit low code. i replaced the o2 sensor with two different ones and the code p0051 comes back right away. the heater circuit gets 12.5 volts when activ...
April 26, 2006