C1A11 on Toyota
Front Radar Sensor Incorrect Axial Gap (Beam Axis Misalignment)
C1A11 on Toyota vehicles indicates front radar sensor incorrect axial gap (beam axis misalignment). Au7o has documented this code across 1 Toyota model — most commonly on Land Cruiser. C1A11 is a manufacturer-specific code (commonly Toyota/Lexus) indicating the front millimeter-wave radar sensor's beam axis is misaligned (incorrect axial gap). This radar supports driver-assistance features such as dynamic radar cruise control, pre-collision/automatic emergency braking, and lane-departure assist, all of which depend on the radar pointing accurately. When the sensor is off-axis, the module flags this code and typically disables the affected safety systems until the radar is re-aimed/calibrated. Basic driving is unaffected, but the crash-avoidance features may be inactive.
Common Causes of C1A11
- •Sensor knocked out of alignment by a collision or curb impact
- •Bumper, grille, or radar bracket replaced without recalibration
- •Calibration/aiming procedure not performed
- •Bent or damaged sensor mounting bracket
- •Faulty front radar sensor
- •Heavy debris, ice, or aftermarket part obstructing/skewing the beam
- •Damaged wiring or connector to the radar
C1A11 on Toyota by Model
Toyota Land Cruiser(1 issue)
- Driver Assistance False Alerts and Temporary Sensor Blockage Warnings in Rain, Dust, or Snow2024-2025
Owners have reported Toyota Safety Sense warnings, unavailable adaptive cruise, and intermittent pre-collision or lane-keeping alerts when the radar or camera becomes obstructed by weather, road film, or dust. While some level of sensor blockage is expected, complaints indicate the system can become unavailable sooner than expected in real-world conditions, especially on dirty winter roads or off-pavement use. The result is nuisance warnings and loss of driver-assist features until the sensors clear.
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View C1A11 across all makes →Frequently Asked Questions
What does C1A11 mean on Toyota?▼
C1A11 stands for "Front Radar Sensor Incorrect Axial Gap (Beam Axis Misalignment)." C1A11 is a manufacturer-specific code (commonly Toyota/Lexus) indicating the front millimeter-wave radar sensor's beam axis is misaligned (incorrect axial gap). This radar supports driver-assistance features such as dynamic radar cruise control, pre-collision/automatic emergency braking, and lane-departure assist, all of which depend on the radar pointing accurately. When the sensor is off-axis, the module flags this code and typically disables the affected safety systems until the radar is re-aimed/calibrated. Basic driving is unaffected, but the crash-avoidance features may be inactive. On Toyota specifically, this code is documented across 1 model.
What causes C1A11 on Toyota vehicles?▼
Common causes on Toyota: Sensor knocked out of alignment by a collision or curb impact, Bumper, grille, or radar bracket replaced without recalibration, Calibration/aiming procedure not performed, Bent or damaged sensor mounting bracket, Faulty front radar sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1A11 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have C1A11 documented?▼
Au7o has documented C1A11 on 1 Toyota model: Land Cruiser.