Your best bet first step is to run a scan with vagcom and see what’s causing the cel and epc light to come on.I have a 2015 GTI, APR Stage 1 wit airbox mods and a clubsport exhaust. I've been running a few Track Night America events and have had issues with the EPC or the EPC + Engine light coming on late in the event. I'm running at PIR and general this has happened in the 3rd session of the night. I'm usually running right up to redline, but not blowing past and on the front and back straights I'm usually maxing out at 110mph. Friday night, third session I was about 3 laps in, through turn 9 and running down the back straight, just passed 100mph not close to redline and both the EPC and engine light came on, but it didn't go into limp mode. Bailed on the session and went back to the paddock to shutdown/cool down. Restarted and the EPC light was off, but not the check engine. This has happened at my last two track nights and with another coming up in a couple weeks I'd like to get whatever the issue is sorted. Any thoughts? Tried search the forum, but couldn't find anything related to redline/high speed or trackdays.