Chassis
generic / SAE
C0033
Left Front Wheel Speed Sensor Signal Erratic
The control module sees erratic pulses from the left front wheel speed sensor at speed. Common cause is metallic debris on a magnetic encoder or a damaged tone ring.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number– / 33
Possible causes
- Magnetic encoder ring contaminated high
- Tone ring cracked or missing teeth medium
- Connector with intermittent contact under vibration low
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–450 €
- Estimated time: 0.5–2.5 h
- Component: wheel speed sensor fl
- Component: tone ring
- Component: hub bearing
Sources
References
sae:J2012