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P0031 Diagnostic Trouble Code Discussion for December 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
2004 Toyota Corolla CE 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1NXBR32E14
P0031: Air Fuel Ratio Sensor (Bank 1 Sensor 1) Heater Circuit Low Input. ... Verified. Smooths out at about 1000 rpm and while driving has lots of power no hesitation. Had code P0031,PO134,P0300,P0301,P0302,P0303,P0304. tested o2 and found heater circuit bad replaced with factory o2 and scanner s...
December 07, 2011
2007 Toyota Tacoma 2.7L MIL Lamp on VIN: 5TEUX42N87
P0031: Air Fuel Ratio Sensor (Bank 1 Sensor 1) Heater Circuit Low Input. This tacoma will set a code p0031, on cold start. It sets on a cold start everytime the ambient temperature is below 40ish degrees. We replaced the 1/1 AF sensor with a toyota replacement. Light came back on, we have battery voltage to the sensor from the a/f ...
December 07, 2011