A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- Tires of different sizes or pressures
- A space-saver spare wheel
- The tone ring or the bearing’s magnetic ring: a crack, dirt, stuck-on metal shavings, bearing play
- The sensor isn’t seated properly: too big a gap to the ring, or rust under the sensor
What you can do yourself
- With this fault ABS usually switches off: the ordinary brakes still work, but without ABS the wheels can lock. Brake smoothly and leave a bigger gap, especially on slippery roads.
- Check that all four tires are the same size and inflated to the placard pressure; use a space-saver spare only for a short while.
- A scan tool’s live data shows each wheel’s speed: while driving, this wheel should read the same as the others.
Stop and don’t drive on if:
- The red brake light is on, or the brake pedal feels soft or sinks
- The steering became very heavy, or the car pulls to one side when braking
The explanation comes from the error code reference in the AvtoElektrik PRO app.