Volvo XC90 persistent high squealing noise from the engine on Volvo XC90

Some Volvo XC90 owners report experiencing a persistent high squealing noise from the engine, often attributed to several potential causes. These owners note that belt issues, such as a loose or worn accessory drive belt, can lead to this high-pitched sound. Additionally, low engine oil levels are reported to increase friction and contribute to engine noise, highlighting the importance of regular oil checks. Worn engine mounts are another concern, as they can cause vibrations that result in noise if not replaced. Some owners also mention that improper fuel combustion, faulty spark plugs, or valvetrain issues may contribute to the problem. For accurate diagnosis and resolution, it is advisable for owners to consult a qualified mechanic or Volvo specialist.