That's one of them.
When I get a new (very old) P2, I always change the tensioner and idler pulley as well as the belt and alternator pulley if it is in anyway suspect. Check the others by hand.
For the price of the idler and tensioner, it's worth changing them whilst the belt is off for piece of mind if nothing else.
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2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles
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