Belt squeak could be a drive belt tensioner, easy way to diagnose is spray some WD40 or similar on into the tensioner bearing to see if the noise disappears. Replace it if it does.
Pros: easy to diagnose
Cons: belt squeak
Owner reviews for drive belt tensioner
Manufacturers
My dealership quoted me $710 for the drive belt tensioner which had a small leak. At around 38,000 miles. Probably a crappy design by Mazda if everyone’s starts to leak around that mileage.
Cons: crappy design, small leak
Mileage: 61155 km
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