See also:

Audio System
NOTE: If you install an aftermarket HID headlamp, your vehicle's audio and electronic device may malfunction. ...

Use of MTBE
HYUNDAI recommends avoiding fuels containing MTBE (Methyl Tertiary Butyl Ether) over 15.0% vol. (Oxygen Content 2.7% weight) in your vehicle. Fuel containing MTBE over 15.0% vol. (Oxygen Content 2. ...

SCHEDULED MAINTE- 3 NANCE REQUIREMENTS
o Inspection should be performed any time a malfunction is experienced or suspected. o Receipts for all emission control system services should be retained to demonstrate compliance with conditions ...