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 NX 300h BaseFACTORY OEM SERVICE PROCEDURE
Front Radar Sensor System
FRONT RADAR SENSOR SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1A1100 | Front Radar Sensor Optical Axis Misalignment Malfunction |
| C1A8C46 | Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure |
| C1A8D1C | Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range |
| C1A9000 | Malfunction of Millimeter-wave Circuit in Front Radar Sensor |
| C1A9100 | Malfunction of Acceleration Sensor in Front Radar Sensor |
| U010487 | Lost Communication with Cruise Control Module Missing Message |
| U030557 | Software Incompatibility with Cruise Control Module Invalid/Incompatible Software Component |
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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