2002 WinStar Checnk Engine Light is on

All,

My 2002 WinStar Checnk Engine Light is on for months. The manual said that check the following areas:
A. Poor quality of fuel
B. Gas cap is loose
C. Check mechnical

I have try A & B many times including good fuels & close gas cap.

However, the engine warning light still on.

Any sugestion?

Your inputs is appreciate.

David

We really need to know the exact code to pinpoint what help you may need.
Take it to AutoZone or a similar place that can scan the computer for no charge and then let us know.