What are the symptoms of a faulty car turbocharger?

[Bonnie]

The symptoms of a faulty car turbocharger are: 1. Poor sealing of the turbocharger impeller shaft, manifested by: blue smoke from the exhaust at idle, varying in intensity; 2. Severe blockage of the exhaust gas recirculation pipe, manifested by: blue smoke from the exhaust at idle and while driving; 3. Wear or aging of piston rings, cylinder walls, or valve oil seals, manifested by: heavy blue smoke from the vehicle, abnormal noise from the turbocharger turbine end, and oil leakage from the turbocharger turbine end; 4. Cracked turbocharger air duct, manifested by: a "fluttering" abnormal noise when accelerating or decelerating. A turbocharger is an air compressor that increases air intake by compressing air.