Cadillac DeVille Problem Report
Cadillac DeVille Check Engine Light Due to Gas Cap or Catalytic Converter
I keep getting MIl Code P0440, and have repaired everything in evap system w/o curing this problem. - Visitor
check engine light on code po443 evap emission system purge vent soleniod circuit condition. wh...
replaced evap soleniod near gas tank and the one on the intake also replaced gas cap. cleared...
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.