Hi,
Last ditch, check fuses # 15 & 18. Window open, door locked, turn the key to the “Run” position & let it sit 10 minutes. Remove & unlock the door through the open window, insert into ignition & attempt to start. That’s the last of the “things thatve worked for others”, that I know of. I’d suggest calling a locksmith to come out to reprogram you’re keys, once your certain it’s not another issue. Be sure the specific ones you call are capable of doing it.
If the dealer had the key & car- yes, they could tell you if it was a PATS issue. With only a key, only a best guess. Increase the price of the car to offset some of the.cost.
Don’t kill your battery by turning it over, if you try a few more things just turn the key to on. No pump prime, it won’t start.
PATS spits a certain amount of flashes of the security light based on its status is. A Scan-tool will show other trouble codes, pending & hard.
You can measure voltage at the pump’s inertia switch with someone turning the key to run once you have voltmeter leads in place to see if.voltage is present for initial prime. Also turning the motor over. Don’t overdo it & drain your battery. There’s also EEC pins that voltage will be present at. Will be in shop manual.
Regarding motor firing at all after battery replacement, it’s impossible to tell, but unlikely an EFI driven motor would Fire a few cylinders off without a prime.
Depends on how recently the last run time was.
There is public domain software available to reprogram your PATS key, some free, some will cost. Around 250$ to have a locksmith come out & do this. I’m still unclear on the 2nd key, is it a transponder key, or just a regular key?
Cannot be near the other key when attempting to use it. It will not start if not a transponder key. (Plastic keyhead).
Link below:
How to program a new keyless entry remote control
www.fordf150.net
Good luck! Wish I could help more.
-John