Car is a 2014 Mustang GT, everything is stock except the exhaust which is a MBPR . Had a code come up on the CEL which was P2096. My car would also stall out at a stop light on longer drives. I decided to get aftermarket Downstream O2 sensors and swap them out. After installing the new sensors I attempted an Auto Idle Relearn process and went through the steps. Went for my test drive and it stalled about a 1/4 mile in. RPM’s read 1500 at start up, 1000 at complete stop, then dropped to 750...

Stalling and Dying after O2 sensor swap