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 is saying that the sensor that tells how fast the right front wheel is spinning isn't working properly.
This code is triggered when the vehicle's computer detects a low voltage signal from the front right wheel speed sensor.
The C1204 code indicates a problem with the electrical circuit of the front right wheel speed sensor, which is part of the vehicle's anti-lock braking system (ABS). The sensor measures the rotational speed of the wheel and sends this information to the ABS control module. A low circuit signal suggests an issue with the sensor or its wiring, potentially affecting the ABS function.
• ABS warning light illuminated
• Inoperative or malfunctioning ABS
• Inconsistent speedometer readings
• Faulty front right 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 front right wheel speed sensor for damage.
• Check the wiring and connectors for corrosion or damage.
• Test the sensor's voltage output with a multimeter.
• Replace the faulty wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ABS control module if necessary.
• Multimeter
• OBD-II scanner
• Socket set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford Fusion
• Regularly inspect ABS sensors and wiring.
• Keep wheel wells clean to prevent sensor damage.
• Perform routine vehicle maintenance checks.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if unsure.
Check with the vehicle manufacturer for specific warranty coverage on ABS components.
The C1204 code has been a common issue in vehicles with ABS systems, often due to environmental factors affecting sensor performance.
Moderate – While the vehicle can still be driven, ABS functionality may be impaired, increasing the risk of skidding during braking.
Operating a vehicle with a malfunctioning ABS system may compromise safety and should be addressed promptly.
• Vehicle must be on a flat surface.
• Ensure the ignition is turned off before testing.
The front right wheel speed sensor is located near the brake rotor on the right front wheel.
Q: Can I drive with a C1204 code?
A: Yes, but it's not recommended as the ABS may not function properly, increasing the risk of skidding.
Q: How do I reset the ABS light?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code and reset the light.
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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