[AtlasM]

I've been getting a persistent SES light after installing my VRSF catless downpipe and DP fix. According to VRSF, their DP fix is similar to the Area 74 CatSim. I've pulled the codes and am getting the following codes:

P013A - Rear Oxygen Sensor Slow Response Rich to Lean Bank 1 Sensor 2
P013E - Rear Oxygen Sensor Delayed Response Rich to Lean Bank 1 Sensor 2

Whenever I clear the codes they come back pretty quickly.

I'm not sure if this is related to the VRSF DP fix itself, or if something got messed up with my oxygen sensors during the install. Anyone able to help?