I have a 2006 GS300, just took it to the dealer as the VSC light came on and had engine hesitation. After checking them out, I was told that the engine needs to be rebuilt. I was informed that due to carbon built up on the manifold is causing the problem. How is it possible for a car with just 88K miles to have this problem? Should I had them recheck? Perhaps a sensor? Any suggestion (s) is welcome.

 

What were the codes? Carbon buildup is quite common. I rebuilt one with as little as 28k miles.