I had the same code on my 2001 3.0 after I changed the headgasket.
I went to the self serve junk yard and came home with 3 purge valves all for $20. It's not hard to take these out. I made a power source from a 12v calculator transformer and a couple alligator clips and was able to put voltage to the two pins and hear a click. I blew a couple PSI into the valve and activated it and found I had a couple that worked including my original. I used brake cleaner to clean them just for fun. Put the original back in and still got the code. I looked at the connectors on the wiring look under the intake and discovered I had mixed up the only two that could be interchanged. One had only one wire and I had this connected to my purge valve. The configuration of the two connectors were different, one was straight and the other was 90 degrees. My suggestion would be to test the purge valve as I did or if you also had the intake loom off at a recent point, verify the connectors didn't get switched. As a final effort, check for cracks in the vacuum line between the purge valve and the back of the intake manifold to be sure everything is connected.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,