It's right under the steering column on the right hand (directly below where you insert the key for ignition) - it's behind the dash and you can feel it if you stick your hand underneath there.
The diagnostic port on a Hyundai Elantra is found inside the cabin. Lift the steering wheel up to make room. The port is found on the between the hood release and steering column.
Diagnostic port is located on the drivers side under the dash just above the pedals. Kev!!
On my 2004 Megane (II) it is located underneath the cigarette lighter port. Pull off plastic cover of this "coin-tray compartment" and you will expose the diagnostic port.
The diagnostic connector is under the dash on the driver side.
The 2004 Hyundai Tiburon OBD 2 port is behind fuse box door, left above hood release
The 2004 Hyundai Elantra OBD 2 port is on lower edge of dash between steering column & hood release
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