Hi Barbera335,
I do have that fault codes 120208 (charging pressure control, plausibility pressure too high) and 120408 (charging pressure control, deactivation: pressure build-up blocked.
And my car is a 2011 F10 535i. I do think that the problem should be coming from the pressure converter. But what I don't understand is when you said pressure converter were installed backwards." Does it mean when I first bought the car , it was already installed backwards? I didn't have that fault codes before until now and I never touched the pressure converter and no previous repaired.
Should I just get a new boost solenoid and replace it ?
My car has some vibration. When driving, I don't feel it. but when I am at a stop, once car is idle I feel the strong vibration. Strong vibration also happen in the morning cold start. Do you think that is also related to the pressure converter. I wonder if I have to change the vacuum hose along with the converter.
Any information or help will be great. I have been searching for expertise advise online but seem like no one knows but you diagnostic seem very accurate. I would like to hear some feedback from you.
This is the weird sound coming out from the driver side engine bay.
Best Regards
Ced
Quote:
Originally Posted by Barbera335
The vacuum lines to the pressure converter were installed backwards. This causes vacuum pressure to not release and the boost pressure too high fault as well as the deactivation fault are stored. Reverse the lines at the pressure converter and this will correct your problem. The converter is mounted to the side of the valve cover and the lines were probably switched when the spark plugs were replaced. I have seen it before on the N55 engine.
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