The ABS Ring helps the ABS sensors to read the speed from the wheels. Here are the most common symptoms of a bad ABS ring, location, and replacement cost.
How much is the cost to replace an ABS sensor?
ABS Reluctor Ring & ABS Sensor Kit for BMW 3 Series (E46) (330i/M3) [02-07] REAR
Wheel Bearings & Wheel Speed Sensors Repair
How to Clean an Abs Sensor: 12 Steps (with Pictures) - wikiHow
ABS Rings
ABS Reluctor Ring for Smart Car - City / Roadster / Fortwo *FREE RETAINER*
Can A Bad ABS Sensor Cause Vibration? (Symptoms And Fixes)
Solving BMW's ABS Issues: Understanding The Wheel Speed Sensor - YOUCANIC
ABS Reluctor Ring for Mercedes C-Class [W202] (93-01) Rear *FREE RETAINER*