Just had this problem. It IS an issue and it is not wastegate ext. The sound started for me today however, it did not subside. I looked on here and didn't really find any solutions. I drove a bit more and my steering wheel got heavy so thought power steering pump. After that parked the car, popped the hood and smelt hot plastic.
I looked around and I have a pulley totally disconnected from the block. Now that the pulley is totally off the block I don't hear the same clicking noise that we listen to on the videos on this form, instead, I hear the squeaking sound of a slipping belt.
I still don't know exactly which pulley fell off because I have not yet looked in there with detail, I just see a pulley totally detached with the belt hanging off. With that being said, I do suspect that it is the pulley for the power steering pump.
I can't speak for all cars, but if you're hearing this sound then its likely that your pulley is coming loose and that the pulley itself will come off.
Hope this helps.
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