x5 35d Engine Code P0238

[1mGator]

Hi everyone, I have searched and read numerous posts about various issues related to this Engine Trouble Code and other various carbon build up / erg / manifold swirl valves, etc. and would appreciate any direction from the community possible. The language between realoem and terminology people is very confusing at times. Here is the problem:

Engine trouble light on with P0238 - Turbocharger / Supercharger Boost Sensor 'A' Circuit High

Listed Possible Causes (according to engine-codes.com)
- boost pressure sensor harness open or shorted
- boost pressure sensor circuit poor electrical connection
- faulty boost pressure sensor
- faulty turbo/super charger
- engine over temperature
-ignition misfire exceeds calibrated threshold
- faulty knock sensor (KS)

What I have done so far ...

Cleaned part# 13627792260 which is termed on realoem "fuel injection system - pressure sensor. I could not find "boost pressure sensor" terminology and other threads pointed to this item located on the driver side of intake manifold as a possible issue. When I took it out to clean it was clogged with carbon. I cleaned it with MAF sensor cleaner and reinstalled. I do not know how to test this sensor? How would I test to see if the carbon clog destroyed this one?

Next I cleaned the MAF sensor on the cold air intake.

If anyone can give me detail about how to eliminate the possible causes to ultimately identify the issue above one by one in a clear way I would greatly appreciate the advice.

Currently, I clear the code and it goes away until we shut off and re-start the car and then it appears again.

Thank you all in advance for any help!

1mGator