If your vehicle is making a loud squeaking noise, it may be a sign that the tensioner pulley is going bad. When this happens, it's important to take action quickly as the tensioner pulley helps keep the timing belt in place and functioning correctly. If it fails, you could experience engine damage or difficulty starting your car. To determine if your tensioner pulley needs replacing, check for signs of wear and tear such as cracks in the rubber material or corrosion on its surface. Additionally, if there is any wobbling when you turn the wheel by hand then it might need attention too. Lastly, inspect all associated components (such as mounting bolts) for any unusual wear and tear that might indicate an issue with the tensioner pulley system itself.