See also:

Immobilizer system (if equipped)
Your vehicle is equipped with an electronic engine immobilizer system to reduce the risk of unauthorized vehicle use. Your immobilizer system is comprised of a small transponder in the ignition key ...

Keys
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What About Gasohol?
Gasohol (a mixture of 90% unleaded gasoline and 10% ethanol or grain alcohol) may be used in your Hyundai. However, if your engine develops driveability problems, the use of 100% unleaded gasoline ...