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Check control message on the dashboard.

BMW 328i driver terrain malfunction advice needed - Facebook 123432

The car has no boost and runs with reduced power. Check control message on the dashboard

The actuator motor itself is failing.

Faults can sometimes trigger after a complete disconnection of the battery. or has too much play.

The car's computer (DME) is trying to "learn" the closed position of the wastegate valve. The measured closed position is outside the acceptable tolerance, indicating it is not sealing or moving properly. Common Causes:

The physical wastegate flap inside the turbo is stuck, damaged, or has too much play.