Have the code read, that will tell you.
Disconnect battery for 15 - 20 mintues
A defective thermostat can cause the engine to overheat. It can also cause the engine to not reach full operating temperature if the thermostat is stuck open. It is possible this could set the check engine light.
To change the check engine light bulb on a 1996 Crown Victoria you need to remove the molding from around the instrument panel. Next, remove the headlight knob and shafts. Locate the light bulb and turn counterclockwise to remove. Reverse directions to replace with a new bulb.
get a scan OBD2
The only way of knowing that is to use a code reader and look up the code that you get.
check for fuel or spark
No, I doesnt fit. Check the tail of the 1997 and there is a speed sensor. The 2003 doesnt have it.
When the check engine light is flashing , it means that an ignition misfire has been detected
Yeah or maybe the alternator
Check the headlite switch.
Check for spark.