Hey guys,
I picked up an sc4 a month or so ago from s2kguy and its run well the whole time but when I got it there was already an engine code for the passenger side secondary o2 sensor. Since then I got trans code 42 which was obviously the speed sensor as the speedo quit working.
Neither problem has really affected the drivability of the car other than not revving over 4k in first gear. This doesnt really matter too much as I dont go mashing the throttle everywhere but I'd like to get it fixed.

Any ideas which one of these would be causing the problem? i plan on redoing the exhaust eventually and ditching all the cats as well as both secondary o2's so if some of you v8 guys have dealt with this before please chime in.

Thanks