Subaru Impreza WRX (2011)

    See also:

    Stereo indicator
    The stereo indicator “ST” will illuminate when an FM stereo broadcast is received. ...

    Displaying radio PS (Program Service Name) and RT (Radio Text)
    ...

    If the light illuminates steadily
    If the light illuminates steadily while driving or does not turn off after the engine starts, an emission control system malfunction has been detected. You should have your vehicle checked by ...