and, within 10 seconds, insert the second working key . Turn it to RUN for another 3–5 seconds, then remove it.
into the ignition and turn it to RUN (not start) for about 3–5 seconds. How To Program 2003 Ford F150 Key
Keep the new key in the position for several seconds. The security light on the dash will typically stay on for three seconds or the door locks will cycle to confirm success. Method: With Zero or One Working Key and, within 10 seconds, insert the second working key
The 2003 F-150 uses a Passive Anti-Theft System (PATS). You can only program a new chip key yourself if you already have . Method: With Two Working Keys Keep the new key in the position for several seconds
If you only have one key or no keys at all, you use the onboard sequence. You have three alternatives:
Within 10 seconds, and turn it to RUN .