OBD2 OS2 malfunction

Discussion in '2005+ Mustang GT 4.6L Tech' started by louis, Sep 8, 2018.

  1. louis

    louis Junior Member

    I have a 2006 Mustang GT. I started to have the engine sign on the board, so i used my OBDII scanner and it gave me error O2 sensor heater circuit Malfunction Bank 1 Sensor 1. I understand that the sensor needs to be changed. So it's on the passenger side upstream according to many information on google.
    I bought a sensor from Motorcraft DY-1401 Gu2z-9G444-A and i changed it, but the engine signal came back and OBDII gave me the same code error.
    What is the issue? any one had this before? any advice?
  2. 07 Boss

    07 Boss forum member

    Do you have headers?

    Sounds like there is actually something wrong with the circuit if the sensor is good. Check the pins on the connectors and check for wires for continuity. Do you have a multi-meter?
  3. louis

    louis Junior Member

    I have a normal 2006 mustang GT- I frankly don't see what do you mean by headers. Nothing is modified in my car.

    I don't have a multi-meter and don't know from where to start if i have.. Could it be from the fuses?
  4. Juice

    Juice forum member

    Swap sensors with the other side, see if the error code changes. I've gotten bad out-of-box O2 sensor before.