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

Tiny
ASHOK SAINI
  • MEMBER
  • 2012 BMW X3
  • 2.0L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 160 MILES
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.
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Sunday, August 7th, 2022 AT 7:01 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
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
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Sunday, August 7th, 2022 AT 11:11 PM
Tiny
ASHOK SAINI
  • MEMBER
  • 32 POSTS
Can you provide the picture of this component? I can't figure it out the exact part you are referring to.
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Tuesday, August 16th, 2022 AT 4:17 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
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
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Tuesday, August 16th, 2022 AT 6:57 PM
Tiny
ASHOK SAINI
  • MEMBER
  • 32 POSTS
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
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Wednesday, August 17th, 2022 AT 4:23 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
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
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Wednesday, August 17th, 2022 AT 7:18 PM

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