2007 Scion TC (Stock & Auto)

So the other day I hit around 115 on the track. There were times when I was going this speed for an extended period of time.

I've noticed that my car shifts a lot more rough and its acceleration seems to have declined.

I plugged in my OBDII scanner and saw that I am running in open loop while de-accelerating and Closed loop while WOD. My car never used to go into open loop when at normal running temps.

My question is could I have stressed the A/F sensor or MAF or even the CAT to the point of not being able get accurate feedback, causing an open loop?

Could I have possibly damaged something in my car?

 

The TC is not a race car lol.

 

At least he was on the track. Give him some credit.