the sensor is pretty easy to change, it is just under the a/c compressor at about 10:00 o-clock on the front of the engine. it is held on by a 10mm bolt and has a harness plugged into it. it is easier to get to if you take off the acc. drive belt. if you have an international dealer close you can get one there cheaper than at a ford dealer. i would bring the old one with you to make sure you get the right one. it is covered under the 5 year 100,000 mile warranty and all you would have to pay is the $100.00 deductible (i just let the dealer do it under warranty when mine went out at 35,000 miles)