Electric wastegate, adaptation: Limit position closed implausible (or learning limit stop).

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 car has no boost and runs with reduced power.

Code 123432 rarely appears alone. It is usually accompanied by:

Check control message on the dashboard.

BMW 328i driver terrain malfunction advice needed - Facebook

The turbo has been overheating, causing the wastegate flap seat to become loose and move.

The emissions warning light illuminates. Cold Start Noise: Noise 20-30 seconds after start-up. Common Associated Codes