Start by figuring out what the cause of the fault it, then go from there. Check for power at the lights. If you don't have that, check for continuity in the switch. If you don't have that, replace the switch.
check fuses & brake lights switch located on brake pedal
check by the pedals to the left if should be in the paneling there will be a little sticker pointing it out. you'll have to push it up if it has been engaged
not charging the battery properly... check the alternator.
check your fuses check ignition switch
Answercheck the solenoid wire at started for power when switch at start position.If no power, check neutral safety switch, or main ignition switch on steering column under dash.NOT the key tumbler assembly it has a rod that goes down column to the ignition switch
If your check engine light is flashing , an engine cylinder misfire has been detected
What is the problem you are having with the switch?
Check the ignition fuse also check the ignition switch
If you're referring to the Ford Contour/Mercury Mystique, check sites such as eBay, Craigslist, local salvage yards, etc.
check your ignition switch.
Take a continuity tester and check them. you'll find the bad one
Check the Auto Zone website it gives you detail infor How to do it
The ignition switch on a 1996 Mercury Tracer might lock up and release only when the shifter is removed from park and then put in the park position again because the sensor is getting worn. This sensor lets the ignition know that the car is in park and it is safe to remove the key. Check the shift position sensor.
May also want to check the module ontop of the transmission, it's located next to the battery, I'm not sure if the part's correct name is a neutral safety switch.
check the ignition switch , it might be bad and may need to be replaced.
warning code check faults indicated by subsequent codes
HAVE AN AUTO STORE OR SHOP HOOK UP THE OBD2 SCANNER TO SEE WHAT CODES ARE
check your owner's manual
Check local library for service manuals
Check bulbs Check Fuse Check stop light switch
Could beAlso check the starter solenoid and loose or corroded battery cablesand starter
Check the kill switch. and the ignition switch. If no power check all fuses.
I have a 98 mystique, and when the check engine light comes on, I simply disconnect the positive battery terminal for a couple of minutes. When I replace it, the check engine light is cleared. It resets the computer.
Things to check are: ignition switch, manual lever position switch, ignition relay, your starter, and last, your battery. Check all wires, cables and connections for condition and cleanliness.