Where is the plug located in a 2003 wrx?

In a 2003 Subaru WRX, the spark plugs are located under the engine cover, accessible by removing the cover itself. Each spark plug is situated in its respective cylinder head, with four plugs total for the four-cylinder engine. You'll need to unbolt the ignition coil packs to reach the plugs, which are found on the top of the engine. Make sure to use the correct tools and follow proper procedures when replacing them.