Aygo belt tensioner issue

I had a similar issue with my old Opel Corsa. The serpentine belt tensioner pulley went bad, causing a horrendous belt squeal and engine noise. It's like a rubber band that’s lost its elasticity; it can’t keep things tight anymore.

Interesting. How did you figure out it was the tensioner and not something else, like the idler pulley?

The mechanic confirmed it. The belt bringer/handover on the tensioner was indeed defective. Given your Aygo's mileage, it might be worth getting it checked at a workshop; the repair eventually cost me 455€.

Thanks for the info! I'll get it checked out. I really appreciate it!