1991 Ford Taurus take error codes

Maryann,
If want to read the trouble codes for your car you will need to buy a code scanner. They range in price from $50 and up depending on the make and model of the scanner. When purchasing one make sure it is for OBD II for this is the system your car uses. To use the scanner follow the instructions that come with it. A good one will have a screen that displays the directions as you use it in a step by step manner. The scanner gets connected to a plug in connection usually located under the dash on the drivers side. FYI this tool is a great help in trouble shooting your engine management system but don't be confused and think it will fix the problem. It will only lead you in the right direction. Once you know what the problem is you will still need to change the defective piece.
Good luck :) Backyardmechanic

I'am sorry didn't realize your year car. Yes you are right. Cars that are 95 and old are OBD I. Everything else is correct expect for the location of the diagnostic connector which may be under the hood or under the dash depending on make and model. You also mention you need help in pass emmissions. Here some things to look at. Make sure the motor oil is clean, of the correct grade and quailty. Second check the cooling system to see that it is running at it's best. The cooling system helps keep emmissions down. It does this by transfering the heat that the motor produces during normal combustion. The quickier the heat is transfered the lower the emmissions. One other thing is the PCV value may need changing. Hope this clears things up. ?