RULE 1: ALL EFI cars about 1988 to now , there is no ECU

that ever tells you what parts failed, (its not a AI genius puters...)
it can only tell you, what tests failed (called monitors) that directs
the technician to do more manual tests, this is all covered in the FSM. read it.
the cat tests? ignore this, if not a smog test town? (no country stated)
but if you fix all other issues, usually the cats tests pass, fix it last
if at all. end cat eff. comments. (or as your laws direct)

keep the faith, 498
reset the OBD2 codes,
then
tighten the gas cap (seal good?)
then drive 20miles, its ok now right.? 99% factor loose cap...
if above fails (good cap test) (a new cap can fix it too, bad vacuum breaker leaking or seal)
easy path gone......................................
you need to do all the EVAP tests in the FSM.
the first it the leak down test. (tools needed.)
you can make your own tools to do that, i use lowpressure regulator connected to a nitrogen tank and modified gas cap
and a low pressue guage. if it dont hold say 2 psi? for 5min)
then the system is breached, and you get to find it.
but every word here and 100s more on topic are in the FSM
read it, and do the tests stated there, if not get an ASE mech.
he/she can do it. easy.

EPA here, just hates, EVAP fails.. top cause of pollution today.
here is USA< nobody ever posts location (seen 1 in 4000)