Wow, sounds like you REALLY got your money's worth out of the $1.00 mod!!!
Seriously, I would say anyone considering doing this, DON'T yank everything related to the air pump until you've driven the car for awhile. Do the mod, disconnect the connector at the air pump, drive the car until you're satisfied that the codes are gone, THEN rip it all out! If you don't get the results you want, then just snip out the diode. You've only wasted a buck :D