I have had the idler pulley fail, in fact it happened twice. I don’t know why it went the second time but the replacement was fine after that. Both times cashed the belt to fail, second time it was accompanied it smoke but no other damage. The indicator was ‘power system services urgent’ message as the alternator stopped.
The third pulley I got from Euro car parts but was the OEM manufacturer for Volvo (IPA or similar) for about a 1/3 of the price.
When the first one went it started by making a noise that changed with the revs. It was a whining noise. It’s hard to discriminate be but once you know what it is you will hear it on other cars.
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