2004 Ford Focus ZTW wagon 2 litre manual. The speedometer is wonky, the radio goes up and down in volume and the car shutters when ever it feels like it. I live in Guelph Ontario Canada so it is cold -15C degrees I don't want to get stranded on the highway. I travel approximately 25 km one way to work on a highway.
The speed sensor is located on the side of transmission toward the rear of the trans, is simple too replace, if you buy then new one and jack and support the vehicle look under Neath and it simple unplugs then use a crescent wrench take tork off and unscrew it. there will be little trans fluid (1tea spoon ) that will come out and that's normal on a scale of one to ten it rates 2. so not hard.
SOURCE: 1999 ford tauras transmission and speedometer
Replace the speed sensor on the trans that will cause exactly what you describe is happening.
SOURCE: SPEED SENSOR
Start by checking these items-
* Open or short in vehicle speed sensor circuit
* Vehicle speed sensor
* Combination meter
* ECM
SOURCE: 2003 ford focus ztw alternator r+r
what to do to a2003 ford focus if the alternator wire shorted out
SOURCE: ABS speed control sensor burned out
there is one of two places it will be underhood in the fusebox near the battery, or in cabin fuse panel on the driver side.
SOURCE: ford focus wiring
same thing happened to us. My wife came home and said the rear brake lights were stuck on so I assumed it was the brake switch...not so. Took car for a ride and noticed rear wiper did not work and when I hit the brake the rear hatched opened and door locks blew out. I started by looking at the wires in the gromet above the hatch and found almost all the wires were bare. Therefore power was jumping the bare wires and traveling back down the third break light and to the rear brake lights and visa versa.. a very dangerous situation. The best that I can tell is the wires are so short in length that they pull and chafe every time you open and close the hatch...very poor design... Note: we bought our vehicle brand new and some of the wires had electrical tape on them....seems mickey moused.
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