Can a timing belt tensioner make a noise?

Yes, a timing belt tensioner can make noise if it is worn out or malfunctioning. Common sounds include rattling, squeaking, or grinding, which may indicate that the tensioner is not maintaining proper tension on the timing belt. If left unchecked, a noisy tensioner can lead to belt slippage or damage, potentially causing engine performance issues. It's advisable to have it inspected and replaced if necessary to prevent further problems.