Where are the spark plugs in a 2002 Ford Expedition?

The spark plugs in a 2002 Ford Expedition are located on top of the engine, under the plastic engine covers. To access them, you'll need to remove the engine covers. There are typically eight spark plugs, one for each cylinder, arranged in a V-pattern on the 4.6L V8 engine (the most common engine in a 2002 Expedition). The exact location relative to other engine components will vary slightly depending on which side of the engine you are looking at (driver's side vs passenger's side). A repair manual specific to your Expedition's year and engine will provide detailed diagrams and instructions.