Re: throttle body
I don't believe the code will go away on its own....just the MIL, as you've indicated. There are a number of choices though. To delete the code (now historical) you can try disconnecting the battery for a about a half minute (this may require resetting all presets though), go to an AutoZone (free) or dealer ($$) and have them do it, buy a Diablosport or Superchips Tuner (the SC is the best choice, IMO), a DashHawk (also a good choice, IMO), or some other OBDII code reader.
05 LX/RT and 06 WK/GCO, (modded similarly) with MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tubular headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 85mm TB, SOS Coils/.060 spark plug gap.