Frankster

Hi all. I recently had a cel come on and it had to do with the valves. My gtr is a 2018 with 5k miles. I spoke to the dealer and they mentioned they will need to do a diagnostics for $300, but not sure if it will be warrantied since it technically is out of the 4 yr / 50k warranty despite only having 5k miles. Any advice from members here? The exhaust note is muted even in Race, but when I switch to Comfort, it gets even softer. There are little burbles and backfire since the light came on. Any help would be greatly appreciated.

Orcbolg

Is the car going into limp mode?

Frankster

No limp mode. Just Check engine light on and the exhaust is muted in R