What are symptoms when your diesel turbo is going out?

When a diesel turbo is failing, common symptoms include a noticeable loss of power and acceleration, excessive exhaust smoke (often black or gray), and a high-pitched whistling or grinding noise from the turbocharger. Additionally, you may experience increased engine temperatures and oil leaks around the turbo area. If these symptoms occur, it's essential to have the turbo inspected and repaired promptly to prevent further engine damage.