ABS light on-Wheel Speed Sensor Problem
Immediately after a mechanic changed the left rear bearing a got ABS light on.
This is how the problem manifests:
First, when I start engine ABS light is on.
Second, when I start to drive the car the light is on until I reach 12mph (20km/h), then it shuts down.
Finally, when the car reach 30mph (~50km/h) the light is on again and it stays whole the way.
What I noticed is that the breaking system is working strange before reaching 30mph, and it works fine after 30mph.
I returned my car back to the mechanic, he scanned the car but wasn't able to diagnose the problem . He told me that my breaks are fine (although ABS light is on), and that I can drive the car.
Do you have any idea what could be the problem?