Programming a key for a 2003 Ford F-150 involves two distinct systems: the (which allows the engine to start) and the keyless entry remote (the buttons that lock/unlock doors). The complexity of the process depends entirely on how many working keys you currently have. I. Programming the Transponder (Engine Start)
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
and, within 10 seconds, insert the second working key . Turn it to RUN for another 3–5 seconds, then remove it. Programming a key for a 2003 Ford F-150
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 Programming the Transponder (Engine Start) If you only
into the ignition and turn it to RUN (not start) for about 3–5 seconds.