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Q: Trouble Code P1646 on 1998 Cadillac DeVille

TCD read P1646, replaced evap vent solenoid, but problem not solved, mechanic think it could be the PCM , car runs find, just ses lights comes on with P1646 code, I just want to get car pass california smog test.............
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If the mechanic says "I think it could be the..." then they should have a good reason for it. It takes a very good understanding of the system to be able to diagnose these types of problems, which your mechanic doesn't seem to have. Find a Gold Shield Station near you and try having them diagnose the problem. http://maps.google.com/maps?f=q&source=s_q&abauth=ca1626d0:DR7WHawcLJIJ8-DL4Av9CAf-urs&view=text&gl=us&q=gold+shield+smog+loc:+92649,+CA&btnG=Search+Maps
Don't let this mechanic guess with your money!
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