See also:

High mounted stop light replacement
If the light is not operating, have the vehicle checked by an authorized HYUNDAI dealer. ...

Steering Gear Box, Linkage & Boots/Lower Arm Ball Joint
With the vehicle stopped and engine off, check for excessive free-play in the steering wheel. Check the linkage for bends or damage. Check the dust boots and ball joints for deterioration, cracks, ...

Spark plugs
Make sure to install new spark plugs of the correct heat range. ...