Engine Over Boost 2004 XC90
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I am having the same problem with my 03 XC90. Everything is fine for driving under 3000 RPM. But if I get over that, the turbo goes into safe mode and barely moves the car. I get the P0234 CEL code and if I clear it, turbo is back in action. I had 2 P0234 codes so I replaced the TCV, the one right next to the air box. Then, when I "overboosted" and the CEL came back on, there was now just one P0234 code. So I ordered the other boost control sensor at the lower inlet of the intercooler in hopes that this will clear everything up. But after a few days of research it may also be the waste gate. Anyone have any imput on this? I dont have any other problems with it besides the overboost (at the moment).
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jhpa
Volvo XC90
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05-04-2014 10:39 AM