What could be wrong with my car?

Like 2 months a go I took my Mustang 2002 to Good Guys because my temperature gauge was failing and my SERVICE ENGINE SOON light was on. I took it to them and they told me it was the coolant sensor, so since that time I've gone back to them because the temp gauge keeps failing and my light keeps coming on, they have replaced that sensor like 4 times already and even ordered one form the ford dealer and still the problem isn't fixed. I guess every time they scan the code it tells them its the sensor… But why would it fail so many times? Do you think its some wiring problems or what could it be?

Sometimes my temp gauge won't even work at all, like if the car was turned off.

Hi, take it to a different shop. You have a leak in the cooling system. It could be as simple as a bad Radiator cap not holding the proper amount of pressure (7 to 14 lbs) . Take it to a different shop.

I'm not sure about Mustangs but I had a Mazda RX7 Turbo that had a similar problem and it was a bubble that would form in the cooling system that would not allow the antifreeze to flow around the sensor. They had the bleed the system and it always fixed it.

For a superb vehicle maintenance software product that will help you keep up to date with all your car maintenance check out Automotive Wolf Car Care Software
http://www.lonewolf-software.com/automotivewolf.htm

It might low in battery