See also:

Valve clearance
Inspect excessive valve noise and/or engine vibration and adjust if necessary. An authorized HYUNDAI dealer should perform the operation. ...

Filter replacement
It must be replaced when necessary, and should not be cleaned and reused. You can clean the filter when inspecting the air cleaner element. Clean the filter by using compressed air. 1. Loosen ...

To Remove the Ignition Key
1. Turn the ignition key to the "ACC" position. 2. Simultaneously push and turn the ignition key counterclockwise from the "ACC" position to the "LOCK" position. 3. ...