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why is my "service engine soon" light still on after problem was fixed on 2004 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
check gas cap and service engine soon light was on, smoke test confirmed leak from vent selenoid. had it replaced, but service engine soon light came back on. did another smoke test and checked codes and the codes the mechanic got back says its the vent selenoid but mechanic says its working properly
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NO ITS NOT ,TRY ANOTHER MECH ITS GOT TO BE ANOTHER ISSUE IN THAT CICUIT.THE SMOKE TEST ONLY SHOWS VAC LEAKS NOT MALFUNCTIONS
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