When trouble codes are detectd by the engine management system, it can result in PCM reverting to fail-safe mode and when this occurs, the rev limiter can be reduced to less than 3500 rpm.
A faulty O2 sensor can result in lack of power, more like minimal or no response from the throttle. I would suggest rectifying the O2 sensors faults and retest.
Saturday, August 11th, 2012 AT 8:36 AM