Why is my Ford Fiesta rear parking sensors not working?

The parking sensors failing to work on the Ford Fiesta is usually an indication that they need to be replaced, or that there is a blown fuse connected to them. To find the fuse, simply track the wires leading to the parking sensors. You can use Your owners manual, which contains a detailed diagram of the car, to locate both the sensors, as well as the fuse. If the fuse is indeed blown, Youll need to replace them. Replacement fuses can be bought online, at Walmart or just about any auto shop. If the sensors have failed, Youll need to replace them. This is slightly more complicated and is best left to a technician. Its best to take the car to the dealership to get the sensors fixed.