If something has gone wrong with a parking light, the trouble could be as simple as a burned-out lightbulb or involve something more complicated like faulty wiring. For people with even a small amount of technical knowledge, replacing a lightbulb can be quite simple, involving removing the plastic cover, replacing the lightbulb, and replacing the cover over it. However, if the wiring is at fault, the problem is likely complicated enough to require the services of a mechanic. Making a mistake in the wiring of a vehicle could have many unintended and dangerous consequences, and it is best to avoid these problems unless it is necessary.