Charge air pressure control, plausibility pressure too low fault 120308, how do I fix this?

2012 BMW X3
160 MILES • 2.0L • 4 CYL • 4WD • AUTOMATIC
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ASHOK SAINI
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The car listed above has 160,000 miles on it. The code listed above needs to be fixed. I have changed diverter valve, I noticed waste gate when removed and cleaned has lots of oil inside which I cleaned with tools cleaner spray. Rear actuator flap on the exhaust makes noise when I start, it's bothersome, but if i increase the acceleration it stops. I been working on this problem for a few months, I have tightened all hoses, MAF is clean don't know what to do next. Please help and thanks.
Aug 7, 2022 at 7:01 AM
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JACOBANDNICKOLAS
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Hi,

Have you closely checked the air-induction tract between turbocharger and intake-
air plenum for vacuum leaks? They are known to crack.

Let me know.

Joe
Aug 7, 2022 at 11:11 PM
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ASHOK SAINI
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Can you provide the picture of this component? I can't figure it out the exact part you are referring to.
Aug 16, 2022 at 4:17 PM
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JACOBANDNICKOLAS
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Hi,

I think I have the wrong engine information. Does this have a 3.0L six-cylinder? You listed a 4 cylinder above and my mind focused on that.

If it is the six, check for vacuum leaks at the waste gage actuator and all lines around it.

If there is a leak at the waste gate, it may not be pulled shut fully.

Let me know.

Joe

Aug 16, 2022 at 6:57 PM
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ASHOK SAINI
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Hi Joe,

It's a 4 cylinder 2.0-liter turbo 2013 X3...
I tightened the throttle intake boot with a metal clamp ring. It improves performance but 120308Charge air pressure control, plausibility pressure too low fault again kicked in. Do you suggest me to change the Preformed O ring inside the boot. Will it make any difference?
Thanks,
Ash
Aug 17, 2022 at 4:23 AM
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JACOBANDNICKOLAS
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Hi,

I had the wrong year. That's why I got confused. LOL I just went back to find the diagnostics for the code and guess what. It's not listed for the 2013. By any chance, do you have the P code?

The manufacturer's codes jump from 119002 to 121201.

As far as the o-ring, anything that can create a leak can cause the issue.

Let me know.

Joe
Aug 17, 2022 at 7:18 PM