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P0031 Diagnostic Trouble Code Discussion for June 2009

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

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Trouble Ticket Help Requests for DTC P0031
Help Request Posted
2004 Jeep Grand Cherokee Laredo 4.0L MIL Lamp on VIN: 1J4GW48S54
P0031: Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Low Voltage. ... both upstream o2 sensors. ho2s11 5.2 ohm ho2s21 4.3 ohms. tested circuit with load light both circuits show 3 amps and then duty cycles heater circuit w/ 3a each cycle. replaced ho2s11 with denso sensor 4.2 ohms heater circuit. vehicle still throws a p0031...
June 02, 2009