The bearings on the wheels has to be installed one way only, the rotor ring is built into the bearing and if installed the wrong way round the sensor cant pick up the wheel speed causing the ligt to be switched on in the cluster. The diagnostic equipment should pick this up as a fault once the car has been driven, it will see the sensor when you do the diagnostic if the car is standing still but once the car is moving and no signal is send from that wheel it would register a fault into the memory of the PCM that you would be able to retrieve later.
There is a way for you to test the sensor yourself by using a multimeter set on volts, you jack the vehicle up at that wheel, install a vehicle stand to support the vehicle to be safe, disconect the wheel speed sensor and probe the two wires into the sensor, spin the wheel by hand and a small amount of current will be produced meaning the the sensor is working and the wheel bearing is installed the correct way, you can also do a continuaty test on the sensor by switching the multimeter onto ohms, but be very carefull, if this sensor has three wires you cant do the continuaty test because of the integrated circuit in the sensor, the three wire sensors opperate on a voltage from 5Volt and it would be destroyed by the multimeter opperating on 9Volt.
If the continuaty test passes and the bearing is installed the correct way, the most comon fault would be a break in the wiring leading to the PCM
Hope this will be helpfull.
SOURCE: Ford Focus TDCI cuts out when driving -glow plug indicator flashe
factory immobiliser playing up ,get a new ECU unit with the chip out of the key and the key reader
SOURCE: my abs light stays on on my ford focus
when the ABS light stays on it means there is a fault present in the ABS system and the ABS has been disabled, as long as the light is on u just have regular brakes with no ABS, there are many thinbgs that can turn the light on, most common is one of the wheel speed sensors is defective, since these sensors are about $75-100 each and there are 4 of them guessing is a poor idea, so what u need to do is have the ABS systwem tested, there will be a fault code present to help narrow down the defective part or wiring.
SOURCE: ford focus has the ABS brake light on and traction control light
chek the brake fliud level. if low light will set light and abs wont work.
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