i have a 14 v6 automatic and I'm getting a p219a code. i just replaced the o2 sensor so i don't think its that. i have a CAI and bbk catted pipes borla s type. I have been noticing what sounded like an exhaust leak so yesterday when i installed the new o2 i checked the bolts where the x pipe connects to the headers, driver side was loose (where the leak sounded from) but i did not jack the car up or anything so i could only tighten as much as the circumstances let me. the leak sound got noticeably quieter but i can still hear it when the rpms get up. its not so distinct from where its coming from like it was before i tightened those bolts it sounds more like under the center of the car and not so much under the drivers feet. could be wrong though! Ill have to go back and jack it up double check the whole system but does anyone know how to get rid of the p219a code and can it be caused by an exhaust leak? if not what are some suggestions. thank you!