The p1081 is an immobilizer code. It was set when the technician tried to start the car with the scanner already plugged in. Either ignore it or clear it, it does not turn on the CEL.
This is a turbo engine you are describing? The PCV system you are describing sounds like it. The oil separator box is on the alternator side, and there is a vacuum line attached to the intake manifold with a clip.
The two knock sensors have upgraded wiring and plugs. I would call the parts people you are dealing with just to be sure.
Klaus
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Common sense trumps a PhD
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