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Discussion Starter · #1 ·
My 03 XC90 T6 is showing the code PO234-overboost malfunction. It has lost considerable power. From reading this very informative and helpful forum, my diagnosis is the Boost Control Valve. I looked the hoses over and didn't see anything wrong with them. Was planning on ordering the part for $38, but thought I'd ask on here first. Any info is greatly appreciated from this internet mechanic.
 

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Discussion Starter · #2 ·
Well, I replaced the boost control valve (cylanoid). My check engine light went off, but when it hits 2nd gear its like it can't decide which gear to go in. It just keeps shifting around. Does the same thing in manual in 2nd gear. Now i'm not sure if its a turbo problem or a transmission problem. Any ideas?
 
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