Hi,
I have a question regarding the turbo boost and if the oxygen sensors can effect it. I have a 95 850. The car has an erratic idel when first started, but after a few minutes settles down. It has no power when cruising on the freeway, when you step on the gas it takes forever for it to accelerate. I am only getting around 13 to 14 miles per gallon. The turbo gauge only barely moves a hair into the white zone on the gauge. I checked the codes, and came up with 231, and 414. So I have ordered new oxygen sensores and going to replace. 414 says my boost is too high..but my gauge shows that I have very little. I was wondering in the improper air/fuel mixture, caused by bad ox sensores could be causing this, or could I also have a bad boost regulater. I have already replaced all the vacumm lines, and have checked for air leaks and found none. I am really curious about the ECU saying that I have too much boost and the gauge saying something different.

Have you tried to clear your 414 and it keeps coming back? There is a boost pressure regulator on the top of the turbo which may have failed. But I would wait until the O2 sensor is fixed.
There is also a vacuum line under the dash to the gauge, with a connector below the handle to pop open the hood. Make sure it is tight.

Klaus
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1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi

I have cleared it twice and have come up with the same codes. I will have to wait until I get the o2 sensors in, and see if that makes a difference. I was really curious why I would get a reading of too much boost, when I actually am not getting any. Never thought of the line running to the gauge, will have to check that..Thanks