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 bicycle's speedometer stops working.
The C122E code is triggered when the Anti-lock Braking System (ABS) module detects a malfunction in the right front wheel speed sensor circuit.
The right front wheel speed sensor is part of the ABS system and provides real-time data on the wheel's rotational speed. This information is crucial for the ABS to function correctly. A fault in this sensor can lead to improper ABS operation.
• ABS warning light on the dashboard
• Inoperative ABS system
• Erratic speedometer readings
• Faulty right front wheel speed sensor
• Damaged wiring or connectors
• Malfunctioning ABS control module
ABS: Anti-lock Braking System, which prevents the wheels from locking up during braking.
Multimeter: A tool used to measure electrical voltage, current, and resistance.
• Inspect the right front wheel speed sensor for damage.
• Check the wiring and connectors for corrosion or breaks.
• Test the sensor with a multimeter to ensure proper operation.
• Replace the right front wheel speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reset the ABS system and clear the code.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect wheel speed sensors during maintenance.
• Keep the sensor area clean and free from debris.
• Ensure wiring and connectors are secure and undamaged.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if unsure.
• Avoid harsh braking until the issue is resolved.
Check with the vehicle manufacturer for specific warranty coverage on ABS components.
Wheel speed sensor issues have been common in vehicles with ABS systems since their introduction, often due to wear and environmental factors.
Moderate – While the vehicle may still be drivable, the ABS system may not function properly, affecting braking performance.
Driving with a malfunctioning ABS can increase the risk of accidents, especially in slippery conditions.
• Vehicle on a lift or jack stands
• Ignition in the 'On' position without starting the engine
The right front wheel speed sensor is located near the wheel hub assembly on the passenger side of the vehicle.
Q: Can I drive with a C122E code?
A: You can drive, but it's not recommended as your ABS system may not work properly, especially in slippery conditions.
Q: How do I know if my wheel speed sensor is bad?
A: Common signs include the ABS warning light, erratic speedometer readings, and unusual braking behavior.
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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