I had disconneted the negative post on my battery. After reconecting and atempting to start the vehicle, the anti theft light started flashing as well as a blue light on the sterring column. the car will not start. I followed the instructions in my manuel to no avail. HELP. 2005 mustang

You need a mobile lock smith to program the key's to the need PCM . Disconnecting the battery an tounching the battery cables will do nothing .

hi,

check ign fuse in engine compartment, if blown take the distributor cap off and cut the wire that runs to that capacitor( small silver cylinder}, tape the wires off and put it back together replace fuse and see if it starts.

Ford's PATS anti-theft system disables the starter from spinning the engine . Flashing real fast while trying to start the vehicle means the vehicle see's wrong key code ,think's the vehicle is being stolen . Code's stored in the computer , FORD dealer , nothing you can or should do .

Hello Vickie,

It sounds like your battery is dead, or if you're really lucky, your battery cables are corroded.
Pop your hood and inspect your cables at the battery, especially the Positive (Red) lead. If you see white oxidation build up, then the cables need to be removed and cleaned.
If clean, then the battery may be dead. It can be beyond its service life (sometimes there is a date code on the battery so you can determine age).
If the vehicle can be jump started; after starting, turn on heater fan and headlamps to high. If the lights are dim, then the alternator may be bad or is going bad.
Start with the battery first, then go from there.

if the vehicle starts then stops and the anti-theft light is flahing you may need to re-set the pass-key system to do this you will need to atempt to start the vehicle and when it stalls leave the key in that position and watch the anti-theft light. it should flash on and off for about 5 to 10 minutes. when it stops flahing turn the ignition to off then try to restart your vehicle