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P0031 Diagnostic Trouble Code Discussion for April 2011

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
2003 Subaru Impreza WRX 2.0L Misfire VIN: JF1GG29633
P0031: Air Fuel Sensor (Bank 1 Sensor 1) Heater Circuit Low Voltage. Check engine light on, running rough, felt like misfire. Was sure scan would reveal which cylinder was misfiring, but only had code for front A/F sensor. Replaced so I could see what fuel trims were doing. With old sensor could not get into closed loop. Fuel t...
April 28, 2011