Engine light on 2001 Ford Windstar

Often the first CE light comes on for oygen sensors.
You can have the CE light checked at any parts store like autozone for free (they have a basic scanner that will tell you what the light means and can sometimes steer you toward the correct replacement part and how to do it yourself, if it simple.
I also recommend a subscription to vehicle manuals and technical service bulletins for your vehicle at www.alldatadiy.com to be armed with info whenever you go to the dealer. I never go without researching first. They will certainly research at your expense!
Learn the basics of your vehicle to save money.

You will need to get it Diag, at a dealer or known good repair shop, It can be both engine or transmission problem.....changing oil,fuel,installing additives wont fix it...so don't waste your money....