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For 1.8L DOHC (mine is 2002, but 2003 should be the same) Open hood. Remove large plastic shield covering engine. Under the shield are two rectangular packs sitting side-by-side. The four spark plugs are under these two packs, deep in the engine - you will need an extension (and possibly a piece of hose) to get them out. Be careful not to strip the threads in the engine when installing new plugs.

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