The car is actually a ford 500 but couldn't find it in the model so this is as close as I can get
Fail-safe is a limp home mode for the computer to help get the car to a repair shop.
The two most common issues are a cooling system problem or throttle body-fuel pump.
You should be able to have the computer scanned for trouble codes and proceed from there.
SOURCE: ferrari 360 modena f1 speed restriction, safe mode
This great car does not have speed limiter, as you said the limiter is starting because the ECU detects a problem and put the car in limp mode, starting the Rev limiter.
The only way to know the problem is by connecting the car ECU to a code reader, and interpreting codes.
If the car goes in limp mode when you press the brake pedal can be a brakes related problem or even a contact on the brake light wirings, check if the lights are are working.
Ask your mechanic to scan the ECU, this will tell you what the problem is.
SOURCE: Solution for the message "engine fail safe mode" in explorer 2005
I have hearing a lot of this lately with Fords. Most of the time this dash board light comes on due to problems with the Throttle Body (TB)not just your coolant,etc.. If it is sticking,dirty,causing misfires,etc. then this can cause an engine fail safe mode.You might first try putting in some injector cleaner and a higher grade of gas.Many people I know who have had this problem have had to have their TB cleaned and/or replaced. This is something Ford dealerships now about,but hasn't been made a recall or anything.There are service bulletins though.Mainly keeping cleaner in your gas and performing ritual tune-ups/oil changes may be the only thing you can do.Hope this helps
Just because there is a code does not necessarily mean that part is bad, but an area to test to find the actual problem.
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