2004 Ford Explorer wont start after battery change-anti theft

You take it to a guy like this or dealer 2004 Ford Explorer PATS Key Theft Light Issues

The battery reset protocol usually means the 8 turns routine using the original keys with key fob transponders
Turning the key and moving the shift from park to drive and back again has helped some people
More information here

https://www.cargurus.com/Cars/Discussion-c112_ds558688

When my anti theft went off because I changed a battery, mind you it was an oldsmobile I had to take it to a dealership so that they could reprogram the theft system

Do you have a question ?
Have you tried another key ?

Its a good possibility that the Anti-theft is interferring with the circuit. If you have an extra ignition key, use that in case the password chip in your regular FOB has detriorated.

There is a brake sensor which is on the upper brake pedal. It interlocks with the starter to prevent starting without having your foot on the brake pedal. Check your brake lights for operation. If the brake lights stay dark with your foot on the pedal, the switch is broke or knocked out of position. A common problem.

Next, there are small wires for the starter solenoid. You can use a test light on one removed wire and ground the test light to the vehicle, the other end in the small wire. Turn the keyswitch to start, with brake pedal pressed and see if it lights up. If it does light up, the starter solenoid may be bad.

Battery level. Ford Anti-theft and some say Battery-saver, can cause both starting and charging problems. A fully charged battery can be at 13.2V- 13.6V. When Ford systems detect low voltage it can activate the Anti-theft, battery-saver, and even disconnect the charging system to allow the battery to completely drain. In some cases the Anti-theft drops starter voltage to around 7V so the starter will not spin. Have the battery tested.

I know of 2004 trucks that were jump started and showed charging, then after 5-10 minutes they lost the charging system. Some people lost the charging system at 70MPH and drove until they stalled. All because of the automatic features built into the trucks. A new battery fixed the problem. Your problem could stem from this.

change ur 10 amp fuse under the dash

could be a starter. is the theft light blinking fast? my email is [email protected]

you could pull the fuse disabling th anti theft totally.. not sure that would work though

The key you have has a computer chip in it. If the car is broken in to and the thief tries to steal you car by jumping wilre. The car will not start. You need that key or one that is programmed for your car. I suggest that you do not lose this key as they are pretty expensive to replace. Around 140.00. I hope this helps. Don't forhet to rate my answer.