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
If you only have one key or no keys at all, you use the onboard sequence. You have three alternatives: How To Program 2003 Ford F150 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
Within 10 seconds, and turn it to RUN .