Five weeks ago, I took the car to the dealer to read the key and ascertain what work was required as it was nearing the 4 year service. (A BMW 3 series, made in August, registered in Sept 2009.)
One minute out of the dealer, and BONG, warning lights come on in the cluster... Bugger.
ABS, traction control, dynamic stability control and cruise control all now not working.
Took it to my friendly Indie whom diagnosed an ABS sensor failure.
Sensor changed, and all was good.
Yesterday, driving along and BONG, again the same warning lights in the cluster.
Got home and removed the wheels. Put a DVM on the sensors;
First one, open circuit, but reading 0.4 nF capacitance. Ah-ha.
Second one, also open circuit and 0.4 nF capacitance. Hmmm.
Checked the one that had been replaced recently (genuine BMW part), 358k ohms and 0nF capacitance.
The fourth one, open circuit and 0.4 nF capacitance. Really ???
How likely is it that three ABS sensors can fail together, weeks after the first one ?
I suspected the common failure of the ABS module, but was told that the failure on earlier cars.
Thanks
David