There is a single copper gasket on the drain plug.
Many causes for the 'check engine light' besides the gas cap. One common one is the MAF which sits by the air filter box. Do a search for this item to see what codes are kicked out and what others have done in the way of repair/replacement.
Many causes for the 'check engine light' besides the gas cap. One common one is the MAF which sits by the air filter box. Do a search for this item to see what codes are kicked out and what others have done in the way of repair/replacement.