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V70 185 D5 - loss of boost and power (P023800 P02346 fault)

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Old Nov 15th, 2023, 18:07   #11
Stu B
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Thanks for the replies. I have ordered a replacement Bosch MAP sensor for the intercooler (with a 5 year warranty this time and free return option if I donít need it).

My thinking is that by the time Iíve removed the 3 year old sensor in there now, even if it looks ok or like it just needs a clean, Iíd rather replace it than do the job again soon for the sake of my knuckles. I remember it being a fiddle last time.

Iíll have a look for leaks and other possible causes whilst Iím swapping that, probably at the weekend now by the time the part arrives, I have time and daylight.
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Old Nov 15th, 2023, 18:28   #12
Kev0607
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Originally Posted by Stu B View Post
Thanks for the replies. I have ordered a replacement Bosch MAP sensor for the intercooler (with a 5 year warranty this time and free return option if I donít need it).

My thinking is that by the time Iíve removed the 3 year old sensor in there now, even if it looks ok or like it just needs a clean, Iíd rather replace it than do the job again soon for the sake of my knuckles. I remember it being a fiddle last time.

Iíll have a look for leaks and other possible causes whilst Iím swapping that, probably at the weekend now by the time the part arrives, I have time and daylight.
Where did you order it from? Was it expensive?
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Old Nov 16th, 2023, 14:00   #13
FreshAir
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Iíll have a look for leaks and other possible causes whilst Iím swapping that
When my Intercooler exit pipe failed it was near the intercooler exit which from what I read was the common area for it to fail, I couldn't see any splits as such, all I could see where a few tufts of the reinforcing weave from the pipe sticking out, plus watery/oily spray in the area. I could hear the boost leak as well.

Hope that is of some help - good luck.
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Old Nov 17th, 2023, 18:24   #14
Stu B
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Where did you order it from? Was it expensive?
From a seller on eBay, £36.


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Originally Posted by FreshAir View Post
When my Intercooler exit pipe failed it was near the intercooler exit which from what I read was the common area for it to fail, I couldn't see any splits as such, all I could see where a few tufts of the reinforcing weave from the pipe sticking out, plus watery/oily spray in the area. I could hear the boost leak as well.

Hope that is of some help - good luck.
Thanks, that is of help - much appreciated. If the rain stays off for a while this weekend Iíll investigate
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Old Nov 21st, 2023, 12:51   #15
Stu B
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Update: It was the MAP sensor again, the old one was a bit grotty but rather than clean it and try it I fitted the replacement item Iíd already bought. Wiring looked fine as did the MAF. I checked all the boost pipes with the car on ramps and couldnít see any issues but I also cleaned out the throttle body whilst it was accessible as the butterfly in there and EGR had accumulated plenty of crud.

All back together, faults reset, a few test runs at the weekend and then a commute yesterday. All fine and feels plenty ĎPolestar optimisedí again

Cheers
Stu
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Old Nov 21st, 2023, 19:26   #16
Seb Van Ders
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I currently have P023800 as well come up. with the car boosting normally and sometimes will cut off boost pressure at around 2.5k revs. Iíve replaced the MAP sensor but the issue still exists. not sure what it could be. I wonder if the VNT vanes are a bit clogged up with carbon build up which could make them stick. so I think iíll disconnect the actuator and see for myself if itís sticking. if anyone has any suggestions let me know.
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