Update, the car now has 114k and I am experiencing an underboost condition again. No apparent leaks in the piping, goes into limp mode on the highway under load. If this new turbo has failed already I am going to get rid of the car. Garrett is a well known turbo but this is getting old. Oil...
I had a similar issue. Wastegate would open causing limp after a pending underboost code. Since I had just bought the car I didn't think anything was wrong, just a small engine trying to keep up on the highway. No CEL for a few months until it finally came on due to underboost condition. Did a...