Mercedes C003100 – Left Front Wheel Speed Sensor Fault
System: Braking System / ESP / ABS Component: Wheel Speed Sensor (Front Left)
Typical Symptoms
• ABS warning light illuminated
• ESP warning light may also appear
• Message: “ESP Inoperative” or similar
• Traction control disabled
• In some cases, speed signal issues
Fault Codes
• C003100 – Left front wheel speed sensor faulty
Possible Cause
• faulty wheel speed sensor
• damaged or contaminated sensor
• wiring or connector issue
• reluctor ring / tone ring damage
Component Location
The wheel speed sensor is located at the front left wheel hub, positioned near the brake disc and hub assembly.
Diagnostic Insight
Wheel speed sensors monitor the rotation of each wheel and send data to the ABS and ESP systems.
If the signal is missing or incorrect, the system may disable:
• ABS
• ESP
• traction control
Technicians usually check:
• live wheel speed data
• sensor wiring and connectors
• condition of the reluctor ring
In this case, the fault was traced to the left front wheel speed sensor, and replacement resolved the issue.
It is important to confirm the root cause before replacing components.
See Mercedes Fault Diagnosis Guide →
Important Note
Wheel speed sensor faults can trigger multiple system warnings, even if only one sensor is faulty.
⚠ Professional Diagnostic Recommended
ABS and ESP system faults require specialist diagnostic equipment. The vehicle should be inspected by a Mercedes-Benz dealer or qualified Mercedes specialist.
