Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the sensor that tells the car how fast the right front wheel is spinning. It's like when your bike's speedometer isn't working right.
The C122A code indicates an issue with the electrical circuit of the right front wheel speed sensor, which is part of the vehicle's anti-lock braking system (ABS).
The right front wheel speed sensor is responsible for sending wheel speed data to the ABS control module. If the sensor or its circuit malfunctions, the ABS may not function properly. The code C122A is triggered when the ABS control module detects an electrical fault in the sensor's circuit.
• ABS warning light illuminated
• Loss of ABS functionality
• Inconsistent speedometer readings
• Faulty right front wheel speed sensor
• Damaged or corroded wiring or connectors
• Faulty ABS control module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics II
• Perform a visual inspection of the right front wheel speed sensor and its wiring.
• Use a multimeter to check the sensor's resistance and voltage.
• Scan the vehicle with an OBD-II scanner to confirm the code and check for other related codes.
• Replace the faulty right front wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ABS control module if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect wheel speed sensors and wiring.
• Avoid driving through deep water which can damage sensors.
• Keep the vehicle's undercarriage clean to prevent corrosion.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if unsure about the repair.
Check with the vehicle manufacturer for warranty coverage on ABS components.
Wheel speed sensor issues have been common in vehicles with ABS systems since their introduction.
Moderate – While the vehicle can still be driven, the ABS may not function properly, increasing stopping distances in emergencies.
Driving with a malfunctioning ABS can increase the risk of accidents. It is advisable to address this issue promptly.
• Vehicle stationary
• Ignition on
The right front wheel speed sensor is located near the brake rotor of the right front wheel.
Q: Can I drive with the C122A code?
A: Yes, but it's not recommended as the ABS may not function properly, affecting braking performance.
Q: How do I reset the ABS light?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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