An illuminated Check Engine Light could indicate that one or more of the ignition coils has failed due to excessive spark plug gap. To fix this problem, the ignition coils that have failed, the spark plugs, and all coil boots should be replaced.
Problems for specific Ford Expedition years:
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Most reported 2001 Ford Expedition problems
The PCV hose may crack, causing the vehicle to idle roughly, this may or may not illuminate the Check Engine Light.