This is a common problem -- buying a used car with a "mystery tune" and without the tuner device. Unfortunately this puts you in a difficult situation . . .
I assume you did not get the tuner device with the car. If you did get the tuner device with the car, then the factory tune should be on the tuner and you can download it from there.
However, if the car is modified, with modifications that REQUIRE a tune to run right, then it will not run right without the tune. The most common example is an aftermarket "cold air intake" where the mass air flow metering section is larger than stock, which requires a tune to "recalibrate" the mass air flow calculations, or the car will run lean.
So, first you need to find out if the car has any modifications that require a tune.
If it does not have any mods that require a tune, you can have it reflashed back to stock by a Ford dealer. I had this done in ~2011 (because I was in this situation) and they charged me about $150, if I remember correctly.
Why do you feel that you must go back to stock tune?
I assume you did not get the tuner device with the car. If you did get the tuner device with the car, then the factory tune should be on the tuner and you can download it from there.
However, if the car is modified, with modifications that REQUIRE a tune to run right, then it will not run right without the tune. The most common example is an aftermarket "cold air intake" where the mass air flow metering section is larger than stock, which requires a tune to "recalibrate" the mass air flow calculations, or the car will run lean.
So, first you need to find out if the car has any modifications that require a tune.
If it does not have any mods that require a tune, you can have it reflashed back to stock by a Ford dealer. I had this done in ~2011 (because I was in this situation) and they charged me about $150, if I remember correctly.
Why do you feel that you must go back to stock tune?
I suppose that is possible, hopefully they were just warning you "just in case" .... it worked with no problem on my 2010 but I don't know if there are new issues in the later models that might cause a problem .... how much did they quote you for the factory tune reflash, assuming it did NOT lock the PCM?
