Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Lexus RC F BaseFACTORY OEM SERVICE PROCEDURE
Pre-Collision System - Diagnostic Codes (1 Of 2)
- Pre-Collision System
- Vehicle Control History [09/2014 - 11/2017]
- Vehicle Control History [11/2017 - 01/2023]
- Vehicle Control History [01/2023 - ]
- DTC C1425-71: Stop Light Relay Actuator Stuck [01/2023 - ]
- DTC C1A01: Driving Support ECU [09/2014 - 11/2017]
- DTC C1A01: Driving Support ECU [11/2017 - 01/2023]
- DTC C1A02: Vehicle Information Not Obtained [09/2014 - 11/2017]
- DTC C1A02: Vehicle Information Not Obtained [11/2017 - 01/2023]
- DTC C1A0A: Front Radar Sensor Region Code Mismatch [09/2014 - 11/2017]
- DTC C1A0A: Front Radar Sensor Region Code Mismatch [11/2017 - 01/2023]
- DTC C1A10: Front Radar Sensor [09/2014 - 11/2017]
- DTC C1A10: Front Radar Sensor [11/2017 - 01/2023]
- DTC C1A11: Front Radar Sensor Incorrect Axial Gap; DTC C1A14: Front Radar Sensor Beam Axis Not Adjusted [09/2014 - 11/2017]
- DTC C1A11: Front Radar Sensor Incorrect Axial Gap; DTC C1A14: Front Radar Sensor Beam Axis Not Adjusted [11/2017 - 01/2023]
- DTC C1A40: ENG / EHV Device [09/2014 - 11/2017]
- DTC C1A41: Brake Request Value Mismatch between ENG / EHV and Driving Support ECU [09/2014 - 11/2017]
- DTC C1A46: Yaw Rate Sensor [09/2014 - 11/2017]
- DTC C1A46: Yaw Rate Sensor [11/2017 - 03/2019]
- DTC C1A46: Yaw Rate Sensor [03/2019 - 01/2023]
- DTC C1A47: Steering Angle Sensor [09/2014 - 11/2017]
- DTC C1A47: Steering Angle Sensor [11/2017 - 03/2019]
- DTC C1A47: Steering Angle Sensor [03/2019 - 01/2023]
- DTC C1A4A: Skid Control Buzzer Circuit [09/2014 - 11/2017]
- DTC C1A4A: Skid Control Buzzer Circuit [11/2017 - 01/2023]
- DTC C1A4B: Stop Light Relay Circuit [09/2014 - 11/2017]
- DTC C1A4B: Stop Light Relay Circuit [11/2017 - 03/2019]
- DTC C1A4B: Stop Light Relay Circuit [03/2019 - 01/2023]
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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