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At first look it would seem there is a problem with the fuel pump control circuit. These vehicles have a module by the radiator that has been known to fail and which includes the fuel pump relay; have you checked it? Also, this is an OBDII system, so the onboard computer should have picked up the fault and set codes. Have you scanned the computer?
Please let me know what you find out and we'll take it from there.
Ouch! I definitely understand what you're telling me has happened; the PATS is no longer recognizing the current ECU, or not communicating with it, so it's flashing code 23 and not allowing the engine to start.
From this point on, all diagnostic procedures would require using a NGS or WDS tester loaded with the appropriate software. I wouldn't know how to help you otherwise, so I will opt out so others can try to help you.
Is the RED THEFT light flashing rapidly when you try to start the engine?The light will flash every 3 to 5 seconds when the key is removed and the doors are closed.
Have you actually tested the PCM (Engine Computer) for trouble codes and also the instrument cluster?
How many keys do you have for this customers car?1 or 2?
Wait a minute...this 3.8L Mustang has a Computer in it from a Ford Taurus?
Can you test the instrument cluster for trouble codes?
The instrument cluster is a module within itself. It contains the PATS key system.