Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that the car's computer is having trouble talking to the sensor that tells it how fast the front right wheel is spinning.
The code C1203 indicates a problem with the electrical circuit for the front right wheel speed sensor, which is not sending signals to the vehicle's computer.
The C1203 code is triggered when the ABS (Anti-lock Braking System) module detects an open circuit or a malfunction in the front right wheel speed sensor. This sensor is responsible for sending the wheel speed data to the ABS module, which uses this information to prevent wheel lockup during braking.
• ABS warning light on
• Traction control light on
• Loss of ABS functionality
• Faulty front right wheel speed sensor
• Damaged wiring or connectors
• Faulty ABS module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics II
• Inspect the front right wheel speed sensor for damage.
• Check the wiring and connectors for any signs of wear or disconnection.
• Use a multimeter to test the sensor's resistance.
• Replace the front right wheel speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Replace the ABS module if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect wheel sensors and wiring.
• Avoid driving through deep water.
• Perform routine maintenance checks.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if unsure.
Check if your vehicle's warranty covers ABS components.
This code has been common in vehicles with aging ABS systems or those exposed to harsh conditions.
Moderate – It affects braking safety features but does not prevent driving.
Driving with a malfunctioning ABS can increase stopping distance and affect vehicle control.
• Vehicle on a flat surface
• Ignition in the 'On' position
The front right wheel speed sensor is located near the wheel hub assembly on the front right wheel.
Q: Can I drive with the C1203 code?
A: Yes, but be aware that your ABS system may not function properly.
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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