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Model Year Affected: 1998
Two likely causes for the Check Engine Light to illuminate would be a loose or worn gas cap or a faulty catalytic converter.
I keep getting MIl Code P0440, and have repaired everything in evap system w/o curing this problem.
Common Problems > Cadillac DeVille
Q&A > Cadillac > 2000 Cadillac DeVille
Q&A > Cadillac > 2004 Cadillac DeVille