Over Boost

Over Boost can be caused for many reasons, the most common ones are listed (below)

Possible Cause(s)

Solution

Air Leak Fine the leak, and replace/repair pipe/gaskets
Turbo internals may be damaged Diagnose and Repair / Replace Turbo
Foreign Matter (Impact) may of entered the inlet pipe Replace the Turbo
VNT Blocked Replace and Repair Turbo
Actuator settings may be wrong Replace Actuator