The good news is, it’s easy to find once you know where to look. The OBD port location in a 2004 Hyundai Sonata is above the pedals in the driver’s footwell, specifically to the left of the clutch pedal.
Here’s a breakdown of how to find it:
To use your OBD scanner, simply plug it directly into the socket. Make sure your car’s ignition is turned to the “ON” position, but don’t start the engine! Once connected, you should be able to use your scan tool to run diagnostics on your vehicle.