How long does a belt tensioner last?

A belt tensioner typically lasts between 60,000 to 100,000 miles, but its lifespan can vary based on factors such as vehicle usage, driving conditions, and maintenance practices. Signs of wear may include unusual noise, squeaking, or a loose serpentine belt. Regular inspections can help identify potential issues before they lead to failure. Replacing the tensioner along with the serpentine belt during maintenance is often recommended for optimal performance.