Think you have a problem....no logical reason for a power loss.
On the exhaust flap, it will throw an ghost error code but will cause no actual problems. Plug it back in & the code goes away.
If you run a JB4 you can turn it on/off through the steering wheel buttons.
2013 135is Cab JB4/ISO - 2011 335is JB4/ISO/BMS Flash - 2009 V-Star
2009 Ford Expedition EL 4X4 - 2003 Xterra 4X4 - 1998 Ranger 4X4 - FF Cobra MK-IV work in progress