Car shows "limp mode" or "reduced acceleration" warnings (possible ECU issue)

[Tracked Emira]

So based on experience today with miltek valve in “mode 1” it definitely causes limp mode and MIL light. Happened repeatedly while pushing hard. Took it out at lunch time and been fine all afternoon. Will be writing to miltek and requesting a refund as its either faulty or doesnt work

I will try not using "mode 1" to see if this helps my limp mode after some hot track runs and ket everyone know.
Has anyone else experienced this with Milltek causing limp mode??

 

[Tracked Emira]

I experienced the reduced acceleration warning and ESC error on a drive on the weekend after driving 1,000 miles. No rain, no wash - car was totally dry. I have 3rd cat delete. It randomly turned on as I was driving slowly through a neighbourhood. Parked locked the car, went for lunch. When I returned, error message gone - drove home 7hour drive - no error again. I assume its something flaky. I guess I’ll wait if it comes up again.

Has the reduced acceleration warning or ESC error come back because I need to j\know if the 3rd cat delete that I have may be an issue?
Has anyone replaced car back to stock and these codes finally disappeared?

 

[Tracked Emira]

Got the car back,
It was a loose MAF sensor in the intake air filter box.

Drove home vigorously with no issues. Let’s see moving forward.

I replaced my air intake with an Eventuri so I will have them check that as well.