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Ever since I have swapped my engine, I get a p2261 error. It is the same bypass valve on the same turbo assembly as the old engine. I have checked the electrical and vacuum connections multiple times. The weird thing is that it seems to work OK. The boost seems well controlled. I can feel the computer controlling it. I have a boost/vac gauge and it will shoot up to 18-20 and drop back down to ~15. I might try a new valve but hate to just throw money at it if it is something else. Anyone else have experience with this issue?
Thanks.
 

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I have the same problem except the turbo came with the 11k mile motor I found. Seems to work fine but light stays on. Did you ever find out what the cause was?
 

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I'm having the same issue I checked all the connections and they seem fine. I ordered the part I'll just wait for it to arrive and will test again. Everything appear to be fine when driving the car. The light came on when I went about 5000 rpm. So I'll just wait and see. I'll update if anything changes
 
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