There could be several reasons for the check engine light to come on. You can take it to Advance Auto Parts or Autozone and if the check engine light is on they will hook it to their computer and tell you exactly what the problem is for free.
O2Sensor.
A check engine light means you have a possible problem with the emission system , you should get the Ranger scanned for trouble codes to diagnose and repair the problem . Once the problem has been repaired the check engine light can be reset.
common problem with 1998 mystique check engine light on
my ranger did the same thing you need to check the wires and the plugs or your o2 sensor behind your cat if ths wont fix the problem you have a serious problem!
The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions. If the check engine light is flashing a misfire has been detected
A check engine light means that a malfunction has been detected with the emission control system - if the check engine light does not go out ( sometimes the problem corrects itself and the light goes out ) have the Ranger scanned for trouble codes in order to diagnose and then repair the malfunction
check map sensor that was the problem in my 89 2.3 ranger
Go to Autozone and have them do a free check engine diagnostic. My 1999 had that problem. It is probably an EGR valve problem. Its a simple fix and helps with fuel efficency.
Take your 2002 Ford Ranger to the garage to get the engine checked.
The check engine light on a 1999 Ford Ranger is between the full mark of the gas gauge and the left turn signal arrow
Something is affecting the emission controls for the engine You would need to have the vehicle scanned for any trouble code(s) to help diagnose and repair the problem
An engine cylinder misfire has been detected if your check engine light is flashing ( I'm not a mechanic / technician but it could be a spark plug , spark plug wire , the fuel mixture , or some other problem )