i think you should take the @Engineer8000 's Suggestion and focus on the emissions computer here
politely said of course, :)
you don't have the trained eye or the testing equipment to diagnose it , most folks don't for that matter , i don't thats for sure ,
he might even have a...
- just because the FCS clicks does not simply mean ist in good working order ?
- have you checked all your fuses in your fuse box ?
- this would be a good place to go next ...