P219A code comes and goes....

[Monolith]

Ok..i did a search and found 1 thread where someone said they had the same problem but it wasn't truly addressed outside of the same "possible's" I read on the internet. I know how knowledgeable alot of you are with Coyote motors and tunes so figured I see if anything new was figured out since 2012.

Problems with diag...I bought this car from a Ford dealership with catless aftermarket exhaust already installed. Previous owner used to frequent here but seems to have dropped off...so I don't have a clue what tune it has....I'm sure it has one because he had the Boss 302 intake with larger throttle body (Which was removed when he sold it) along with the exhaust.

I cannot seem to pinpoint any kind of frequency to the MIL light coming on outside of lower temperatures...seems to be more frequent on chillier mornings.

Has anyone figured out for sure why this is happening?

2012 5.0 with 40K miles.