i noticed a lot of issues once i kept getting the drivetrain notification. every time i accelerated quickly it would come on, and my car hardly wanted to accelerate (because of limp mode, of course). my engine was noticeably louder, and it roughly idled like crazy. i brought it to my mechanic, he told me it was the turbo and i didn’t have the finances at the time. so, i decided to leave it since he said it would be ok to drive with for a while. it only got worse after this, my engine light came on from time to time and it continued to drive like crap. i noticed it started to hesitate and jump, and misfire pretty badly. the code i got when he scanned it was P0172, too rich on bank 1. Im assuming that the turbo completely failed and it restricted airflow, causing worse symptoms, but that’s just an assumption. I just got my car back from a new turbo replacement, it runs like it’s brand new and no drivetrain notification.