Join Date: Jun 2006
Location: Eastern ON Canada
Car: 07 OBW 2.5i D-4AT
Feedback Score: 7 reviews
The cruise control depends in part on the ABS wheel speed sensor signals. On the MY05+, each wheel has a Hall (magnetic) sensor fixed to the steering knuckle. On the back of each hub there's a magnetic strip. As the hub turns, the sensor picks up the signals from the magnetic strip on the hub and sends it to the ABS module.
The magnetic strip has to be made properly, and the hub fit precisely in position so that the sensor will accurately pick up the signal. There have been cases reported here where aftermarket replacement hubs have had problems -- the cruise control malfunctions. It could be poor construction or design of the aftermarkets, but to be fair, it should also be noted that the magnetic strip can be easily damaged if magnetized tools are brought close to it during the installation, or if the hub is banged/dropped/heated, which can remove some of the magnetism.
Also, the sensor can be easily damaged, and if it was removed to replace the hub, it has to be replaced in the same location. Distance from the magnetic strip at the back of the hub is important.