MMT

Some gasoline contains an octane-enhancing additive called MMT (Methylcyclopentadienyl Manganese Tricarbonyl). If you use such fuels, your emission control system performance may deteriorate and the CHECK ENGINE warning light/Malfunction indicator lamp may turn on. If this happens, return to your authorized SUBARU Dealer for service. If it is determined that the condition is caused by the type of fuel used, repairs may not be covered by your warranty.

    See also:

    When “CHECK DISC” is displayed
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    Security indicator light
    This indicator light shows the status of the alarm system. It also indicates operation of the immobilizer system. ...

    CHECK ENGINE warning light/Malfunction indicator lamp
    CAUTION If the CHECK ENGINE warning light/ malfunction indicator lamp illuminates while you are driving, have your vehicle checked/repaired by your SUBARU dealer as soon as possible. Continued ve ...