Compressor/Turbine Wheel Damage
Damage to the turbine wheel in the turbocharger is often caused by entry of a foreign object entering the compressor housing. Something small enough can cause damage to the propellers inside the turbo unit.
You may notice or have been told about lateral movement or ‘play’ in the turbo-shaft. If this is the only problem with your turbocharger, the solution is usually quick and inexpensive.
Variable Vanes Sticking
This can often be indicated by a lack of power when driving. If your car is feeling more sluggish than usual, your turbo may be suffering from a sticky vnt system.
The wastegate actuator acts as a pressure relief valve, which ultimately controls the boost output of a turbocharger. If you’re lacking power in your vehicle, this could be the cause of the issue.