P0442 Toyota - EVAP System Small Leak Detected P0420 Toyota

first check very good for vaccum leak.open hood and start car,listen for hissing noise,air escaping from vaccum hoses.run your hand around all vaccum hoses and listen for a change in motor,also check gas cap seal,if seal is cracked or cap is not tight it will throw a code.vaccum leaks will sometimes throw false codes,and if you had it read at az,adv,or other parts chain they will put the code in their computer and print out probable causes of that code and try and sell you $300.00 worth of parts you dont need.the smoke smell is probably the valve cover leaking.if i am thinking right,your spark plugs are down inside the valve cover.if this is correct check your spark plug wires that go into valve cover and see if they have oil on the wires,if so you need to replace the valve cover grommets as well.if you have a code reader you can clear the code,or unhook battery for a few minutes,after you correct problem.is engine running ruff,skipping,vibrating,or running smooth