I got the same code (P1554) and I decided to go to the dealer and they told me that it was in fact the Vanos Solenoid, they said they didn't replace it, they only cleaned it.
My car was not running smooth on idle.
It was $180 to diagnose.
It's running normal now. They said that if I keep getting the same code that they would have to replace both Solenoids.
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