Hyundai Sonata (2009)

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    Checking the engine oil
    Engine oil is essential to the performance and service of the engine. It is suggested that you check the oil level at least once a week in normal use and more often if you are on a trip or driving ...

    TPMS (Tire Pressure Monitoring System) Malfunction Indicator (If Installed)
    TPMS malfunction indicator comes on for 3 seconds after the ignition key is turned to the "ON" position. If the warning light does not come on, or continuously remains on after comming ...

    Adding equipment to or modifying your air bag-equipped vehicle
    If you modify your vehicle by changing your vehicle's frame, bumper system, front end or side sheet metal or ride height, this may affect the operation of your vehicle's air bag system. ...