I would swap the transducers, but you know that already.

The ECU monitors current draw at the transducers and sets PO243 or PO400 if it isn't what it expects to see.

I beleive that by running a hose from the EGR transducer to the wastegate you proved the wastegate and the EGR transducer both operate, but did not prove the wastegate transducer works.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)