What Does C1142 Mean?
This code indicates the ABS control module has detected a missing tooth fault on the right front wheel speed sensor tone ring. The module has identified an irregular waveform pattern from the RF wheel speed sensor consistent with physical damage to the reluctor ring teeth. This prevents accurate wheel speed monitoring for ABS and traction control at that corner.
Safety Warning
ABS and traction control are likely disabled. Right front wheel speed cannot be accurately monitored. Repair promptly to restore full braking capability.
Common Causes
40%
Cracked or broken tone ring with missing teeth due to corrosion, road debris impact, or metal fatigue
25%
Excessive corrosion buildup on tone ring teeth creating irregular air gaps
20%
Improper sensor air gap due to worn wheel bearing or sensor not fully seated in mounting bore
15%
Metallic contamination on sensor tip distorting the magnetic signal pattern
Diagnostic Steps
1
Step 1: Remove the right front wheel and visually inspect the tone ring. Slowly rotate the hub and examine every tooth for cracks, chips, or missing sections.
2
Step 2: Clean the tone ring and sensor face to remove corrosion, road grime, and metallic debris.
3
Step 3: Measure sensor air gap with a feeler gauge (0.020-0.050 inches typical). Check for wheel bearing play by grasping the rotor and checking for radial and axial movement.
4
Step 4: Use an oscilloscope to monitor the RF sensor waveform while rotating the hub. Look for irregular spacing between voltage peaks indicating a damaged tooth.
5
Step 5: Replace the tone ring or hub assembly if defective, clear codes, and test drive above 15 mph to confirm stable RF wheel speed readings.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected a missing tooth fault on the right front wheel speed sensor tone ring. The module has identified an irregular waveform pattern from the RF wheel speed sensor consistent with physical damage to the reluctor ring teeth. This prevents accurate whe...
The most common cause of C1142 (Wheel Speed Sensor RF Tone Ring Tooth Missing Fault) is: Cracked or broken tone ring with missing teeth due to corrosion, road debris impact, or metal fatigue
Typical repair costs for C1142 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control are likely disabled. Right front wheel speed cannot be accurately monitored. Repair promptly to restore full braking capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1142 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS) / Traction Control System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
