Question about 2004 Ford F150

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I PURCHASED A KEY WITHOUT A CHIP INSIDE AND TRIED TO START MY 2006 F-150 BUT IT FAILED SO I USED MY REGULAR KEY AND IT STARTED. BUT NOW IT WILL ONLY START WITH A PUSHSTART. WHAT COULD THE SOLUTION?

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Check the battery cables, and have the battery tested.
If you can turn the key to the run position, and the theft light ( wart on the top of the dash with the blinking red LED ) go out, PATS ( Passive AntiTheft System ) is working correctly, it would not start with a push start if the theft system was activated.
Could be corroded terminals on the battery, or your battery is on its way out.
Think this was just bad luck to have the cable or battery issues at the same time as the key route you did.

Posted on Jun 06, 2010

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Buy a key with a chip and get the car/keys recoded.

Posted on Jun 02, 2010

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Cheap key to unlock vehicle


Do you have a vehicle that has one of those expensive micro chips embedded in the key? And because of that expense you have not purchased a spare in case of lock outs, well this cheap trick may save you some money. Just have a regular duplicate key made for about $1.00 from your original. Then if you lock yourself out with the original key inside, this key will unlock the door lock. Remember it will not start your car because there is no chip, but it will get you inside if locked out. It worked for my Tahoe and Grand Marquis. It should work for other vehicles too.

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Why does the security light flash even when key is on and engine will not start?


The security light flashing is the indicator. The fuel pump is disabled by the ECU because the immobilizer system does not recognize the transponder chip inside the key.

There could be several causes.
a. Either the transponder chip inside the key is bad, not programmed, or missing
b. The antennae that is located around the ignition lock is bad and/or not reading the transponder chip inside the key.
c. There is a wiring issue between the ECU and antennae.
d. The ECU is bad

You may want to seek out a qualified mechanic or automotive locksmith for help, not all mechanics and/or locksmiths are capable of handling the immobilizer systems on these vehicles. So be clear when discussing your problem to them and make sure they are capable of handling this type of problem.

If the key is not original, check to see if it is a cloned key. Some cloned keys use batteries, when the battery inside the key dies, it no longer communicates with the vehicle. Although it's not common, regular transponder chips can go bad, usually due to physical damage.

An immobilizer transceiver coil tester can be used to test the signal from the antennae at the lock cylinder.

If the ECU is determined to be bad, a used ECU with matching part numbers can be used as a replacement. Contrary to what a dealership or some shops may tell you, all that is required is an immobilizer reset service on the used, replacement, ECU to get it to function with your vehicle. A used ECU and an Immobilizer Reset Service is much cheaper than a new ECU from the dealer. Make absolutely sure that this is the problem before going this route though.

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