Where are the spark plugs in a 2000 Kia Sephia LS?

The spark plugs in a 2000 Kia Sephia LS are located on top of the engine, under a plastic engine cover. To access them, you'll need to remove the engine cover (it's usually held on by a few clips). They're arranged in line with the engine's firing order. You'll likely need a spark plug socket and possibly an extension to reach them comfortably.