Try this, check ground for battery. it may look ok but maybe it is not making good contact to ground. turn key to on, remove the battery ground wire and sand or clean where wire makes contact. after clean, put wire back on to ground. You can put grease on end of connection to keep it from corroding. Turn off the key, then try to start it. If this does not work, Make sure battery terminals are clean and tight. Turn ignition on, light will blink for approx., 10 min. Then turn key to off, then try and start your car. Hope this works for you! God-Bless! ( Light should turn off )
Try to do a hard reset. remove battery cable for 2 minutes and reconect. if it does not work try starting with a spare key. if you dont have a spare key then you have to buy a reprogram a new key. this is something only the dealership can do. well it depends where you are
Your key is failing, hence the flashing THEFT lamp.
If you have a backup key at home, try that one. If it works, and you can get a moment where your 1st key is in the mood to work, you can buy a new key from a locksmith and add it yourself, then throw away the bad key.
There are several variations of THEFT system, and the procedures are similar. Oldest and easiest requires 1 working key in hand to set the car up and allow you to add a new key. The next version requires 2 working keys, but the procedure is the same.
Insert 1 key, or one of of your 2 working keys, turn to run, then remove. within 5 seconds, insert the other key, turn to run, then remove, NOW insert the NEW key, turn to run and watch the THEFT lamp. After 3-5 seconds the lamp should turn OFF. If it does, the new key is accepted and programmed. Throw away the bad key as it will simply become a problem and you cant trust it and the thought someday it might work will simply strand you one day.
If you DONT have a working spare, go buy 2 keys anyway matched to your broken key. You will need 2. If your car is the earliest version (available in 96) you MAY be able to add new keys with 1 working key and your current key works sometimes you say.
Do the above with your 1 old key or with 2 if you have a spare, try the 2 new keys one at a time and see if the theft lamp will turn off. If that fails, you wont lose anything, the new keys are still good, but must be programmed with a scantool. Any good repair shop that can handle programming for FORD will be able to do it. The tools that can do it are fairly common nowadays.
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