G'day,
Did the strut mounts on my Astra J OPC, an oil change and it threw a speed sensor fault somehow (C0040-5A). $100AUD and a speed sensor I didn't need later I discovered that a tab on this washer had broken off and got stuck to my ABS sensor which caused the fault.
What does this thing actually do? I removed it because I didn't have a new one on hand, but its apparently not necessary for the operation of the car, so why does it exist?




