P1514 is related to the idle air control valve which is what is most likely causing the idle issues. That would be the first thing I check. As far as the P0420, that is related to the catalytic converter working below expectations. Fix the IAC first and see if that eliminates the P0420 problem. Let me know if that takes care of it.
The IAC is located on the throttle body. It requires the removal of two screws and disconnection of wires to it. Then it is just a matter of removing and replacing.
Sunday, February 22nd, 2015 AT 8:20 PM