I'm at 20k miles and have been having random misfires approximately every 5k miles - usually happens in wet weather - has been in the dealership 4x times - has been towed in twice because reduced power mode and flashing check engine light. Only mod is Dinan Elite. Dealer said there have been multiple flash updates since I bought the car to address the problem. Has anyone else had this happen?

 

You can always try taking the Dinan out of the equation and see if that helps. Do you still have the bypass plug?

 

Wow, the more I read about Dinan on this forum, I have more doubts about using this on my '19 JCW.

 

I have a 2017 JCW F54 and had two similar codes early on. Had one flash in between. I attributed it to gas issues since I was on extended road trips both times also in wet (more like monsoon) weather. Since the last code I have had a Dinan Elite installed for 14000 miles with no codes. Not sure you are experiencing the same issue but it certainly did not involve the Dinan in my case.