Sounds like you have a probelm with your security system recognizing your key. Check with one of the really good locksmith that also replace ignitions etc.
The security light flashes when a programed key is not installed in the ignition, when you insert a programed immobilizer key in the ignition the security light will go out, the light flashes as a theft deterrent
Cycle the ignition on/off/on/off/on and count the flashes of the check engine light. A pattern of two flashes, pause, two flashes would be a code 22.
How. Do reset airbag light on a 1993 grand marquis
flashes of light
A flashing check engine light normally means you have a misfire.
A flashing Security light is indicating that the security system on your car is active.
While your ignition is own reset your mileage to the total mileage. Turn the ignition off and then back on while holding in the odometer button until the maintenance light flashes several times and resets.
turn on ignition, dont start it. hold down brake and throttle pedal fully for about a minute or until light flashes. sorted
An ignition misfire has been detected
If the security light is flashing you need to change the ignition switch it self. It is likely worn out.
if it flashes when using brakes, nothing is wrong the system is doing what it should. if the light is always on, the system needs repair.
32 and 2132 and 21