How do you replace the parking light bulb located on a 2009 Hyundai I20?

You need to remove the entire headlamp to get to the parking lamp inside. Once removed and you've disconnected the wiring harness, the lamp can be extracted by removing the dust cap and pulling the holder which holds the parking lamp in place. It's quite a tight fit, so it doesn't come out easily, but whatever you do, do not pull the holder out by the wires, or you might damage them. Once the bulb holder has been removed from the head lamp assembly, you can simply pull out the bulb from it and replace it with a similar one. The type of bulb if I'm not mistaken is a T10 5 watt. I replaced mine with an LED equivalent, and you have to make sure that the LED equivalents are the same size as the halogen. As I said before, its a tight fit and anything bigger will simply not fit. Once the bulb has been replaced, you can push the holder back into the headlamp assembly, close the dust cap and reconnect the wiring harness. The tricky bit is getting the headlamp assembly back into the correct position. It took me a quite a few minutes off fiddling with it to get it back, and you have to be patient. Applying too much pressure will permanently damage the polycarbonate or break the plastic retainers on the bottom.

Best of luck, hope it saves you a trip to the workshop.