P1221 comes up as a Throttle Position sensor from my source
Much better than an fault with the active handling system, although parts are still available for the '02 if something like that should go whereas the '99-'00 cars are left hanging in the wind (Steering wheel position sensor)......ask me how I know....
Best way to fix these codes are with a little R&R and then clear the codes. If the car has an aftermarket air filter, it may just have oil on it from when the owner last cleaned the filter, so the MAF may just need a cleaning. This a a very common problem from people over oiling their filters.
Anyway, welcome to the forum!!!! Let us know if you find much else for sale or if you decide to go with this one!