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Thread: 01 Ford F150 check engine light

  1. #1
    Join Date
    Jul 2010

    Default 01 Ford F150 check engine light

    Check engine light came on had it read and gave me the code p0155 (bank 2 sensor 1 heater circuit malfunction) i have replaced this o2 sensor four times now and everytime the light comes back on reading the same code. i have done everything i know to do now. I am at loss. anyone have any other tips.

  2. #2
    Join Date
    Jan 2007


    Hi smitty086,

    Sounds like it isn't a problem with the sensor itself, but rather the heater circuit to the sensor. Modern O2 sensors are heated to get them warmed-up more quickly, which will get the engine management system into closed-loop operation more quickly, which equals better efficiency and lower emissions.

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