My 2009 Mustang GT, 44,000 miles, Manual transmission, sometimes goes into limp mode and the wrench light comes on. If I restart the car, it works again for a day or two until it happens again. Today it happened just as I entered a busy intersection, which felt very unsafe.
I have taken the car to a local mechanic and to a Ford dealership. Neither one could tell me what is wrong with the car since it did not happened while they drove the car and there are no codes in the computer.
Searching the internet, I find advice such as clean/replace Throttle body or Throttle Position Sensor, but why wouldn't the dealer do this if it was appropriate?
Do I have a better option other than driving a car that is unsafe? Can I even sell it in such condition and get a fair price?
Update I ended up buying a a code reader, but the issue never came back, despite daily driving. I am thinking the dealer must have done something that fixed the problem, as part of the $45 service, even though they claimed they could not find what was wrong with the car.