OK, the P0496 is an issue with the purge flow system, most likely a stuck open purge valve. That can have a minor effect on engine performance
The P0121 is a problem with the throttle position sensor and could have a lot of effect on engine performance.
There is a TSB for this issue that applies a special campaign to extend the warranty for this particular issue for 10 years or 120K miles because it is so common.
# 11273B: Special Coverage Adjustment - Throttle Position Sensor Replacement - (Dec 16, 2013)
Monday, July 27th, 2015 AT 2:09 AM