p0031

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    Tacoma Oxygen sensor heater circuit P0031, MAF P0100, and High Volt P3100

    Getting really bad gas mileage. I unplugged one O2 sensor and then started getting P0031, P0100, and P3100. Have cleared with scan tool and codes come back immediately. One interesting thing is when unplug MAF sensor let it stall then start engine again there is no O2 sensor heater circuit...
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