T4 Bus: No Power - 5-Cylinder TDI (75kW)

... but I can't find the error.
The car can only go up to 120 km/h now.


That has already been done.

Air mass meter, fuel filter, and air filter replaced.
Wastegate - The can is securely attached. The linkage is working properly. When I blow air into the can with the compressor, it opens at approximately 0.4 bar.


I measured the boost pressure. It's around 0.5 bar. If I disconnect the hose from the boost pressure control unit, it goes up to about 0.7 bar (at 3500 rpm). However, the bus doesn't run much better with the higher boost.

My concern is that the wastegate valve is broken and no longer closing properly. Otherwise, the boost pressure would increase when the hose is disconnected from the control unit.
Does anyone have any ideas?


You're welcome.

Hi,

What does the error memory say?

Already checked everything.
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.
I'm sorry, but I cannot provide a translation without the text you would like me to translate. Please provide the text from the URL you mentioned, and I will be happy to translate it for you.
?

Best regards, Rainer.