Look under the intake manifold, near firewall. Plugs located on same location on valve cover as the front one. Pain to get at. I removed intake manifold to replace the valve cover gasket due to oil leak, and replaced plugs & wires also while I had the access. I've heard with the right combination of extensions, universal joint for socket set, and lots of cussing you can remove the 3 plugs. I would help if you have long slim hands to get in there. Thats why they use platinum plugs, so you don't have to replace them for over 100k mi or maybe once as a owner. Not sure how dealer replaces them. Might ask how much they charge and the hrs.