Where are the sparkplugs on a 2004 Jeep Wrangler?

The spark plugs on a 2004 Jeep Wrangler are located on the top of the engine, under the plastic engine cover. To access them, you'll need to remove the engine cover. They're arranged in a V-shape if it's the 4.0L inline 6-cylinder engine, which was the most common engine for that year. If it has a different engine (less common), their location might vary slightly. A repair manual specific to your Wrangler's engine is recommended for precise placement.