Hi Guys.
Just though I'd throw this up here to help anyone searching for symptoms in the future.
2016 Hilux - 61000km
A couple of weeks ago my hilux started making a whistle noise like a dentist drill/ siren when under load. It was most evident between 2500 rpm to 3000rpm and was definitely turbo related as it would change pitch and volume directly with changes in throttle position.
There was no noticeable change in performance and no obvious signs like black smoke or the like to indicate anything majorly wrong. It was also an instant change not something that gradually built up.
I checked for things like a leaking or split turbo hose and the intercooler but could find nothing wrong there.
Booked the car into my local dealer and they took some video and audio recording and forwarded them to Toyota. Over the next couple of weeks they needed the car back to try a few different things and get some more info. Finally today I had the car in and they changed the turbo and the noise is gone. The car may have a little more power but I think it's probably more the power of suggestion. I was hoping to get a look at the old turbo but things were pretty hectic when I picked up the ute so I didn't bother trying.
Hope this helps someone in the future
https://m.youtube.com/watch?feature=em- ... 6gvZYXr4D8Cheers
Mark