Make sure you have the right key because the door key will turn the ignition but won't start the car.
ignition switch
why 2003 ford focus stall when air conditioner is turned on
You can find the Ford Focus ignition control module beneath the drivers side dashboard. The ignition control module will be above the accelerator pedal.
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Program a new key and ignition to a 2000 ford focus
i need help with my car
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No
It's in the owner's manual.
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There is a short somewhere in the ignition system causing the fuse to burn out. Start by replacing the ignition switch to see if that helps.