BMW 850CSi Drive Belt Tensioner Replacement Cost.

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The average cost for a Drive Belt Tensioner Replacement is between $399 and $419. Labor costs are estimated between $70 and $89 while parts are priced between $329 and $330. Estimate does not include taxes and fees.

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Common Misdiagnoses

Care must be taken to properly diagnose a noise from the drive belt area. In some cases, it can be quite difficult to determine which component is causing the abnormal noise.

Best Practices

The drive belt(s) should the thoroughly inspected and replaced as necessary when servicing a drive belt tensioner or idler pulley.