Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer thinks the left front wheel is spinning too fast compared to the other wheels.
The vehicle's ABS system has detected that the left front wheel speed sensor is reporting a speed that is higher than expected.
The C1220 code indicates that the Anti-lock Braking System (ABS) module has detected an anomaly in the speed reading from the left front wheel speed sensor, suggesting it is reporting a speed that exceeds the expected range, which might be due to a sensor malfunction or an issue with the wheel itself.
• ABS warning light on the dashboard
• Inconsistent braking performance
• Possible traction control system issues
• Faulty left front wheel speed sensor
• Damaged or corroded wiring or connectors
• Faulty ABS control module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, Second Generation
• Inspect the left front wheel speed sensor and wiring for damage.
• Check the sensor's electrical connections for corrosion or looseness.
• Use a diagnostic tool to read the sensor's output and compare it with other wheel speed sensors.
• Replace the faulty wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ABS control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford Explorer
• Regularly inspect wheel speed sensors and wiring.
• Keep the ABS system clean and free of debris.
• Ensure regular maintenance checks.
Sensor Issue
• Drive carefully and avoid sudden braking until the issue is resolved.
• Consult a professional mechanic for a thorough inspection.
Check your vehicle's warranty for coverage on ABS components.
This code has been commonly reported in vehicles with high mileage or those frequently driven in harsh conditions.
Moderate – Addressing this issue is important to ensure proper braking performance.
Ignoring ABS-related issues can lead to reduced braking efficiency and increased risk of accidents.
• Vehicle must be driven at a constant speed.
• Perform tests on a dry and flat surface.
The left front wheel speed sensor is located near the brake rotor on the left front wheel.
Q: Can I drive with a C1220 code?
A: It's possible to drive, but it's not recommended as it can affect braking performance.
Q: How often should I check my wheel speed sensors?
A: It's good to check them during regular maintenance or if you notice any braking issues.
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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Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
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Universal · Drive-on ramps
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