C1A11 on Lexus
Front Radar Sensor Incorrect Axial Gap (Beam Axis Misalignment)
C1A11 on Lexus vehicles indicates front radar sensor incorrect axial gap (beam axis misalignment). Au7o has documented this code across 2 Lexus models — most commonly on IS, RX. 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. Typical repair costs on Lexus range from $250 to $1,800, depending on the specific model and root cause.
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 Lexus by Model
Lexus IS(1 issue)
- Lexus Safety System+ False Forward Collision / PCS Warnings from Dirty or Misaligned Sensors2023-2025
Some owners report intermittent pre-collision system, radar cruise, or lane-support warnings on 2023-2025 Lexus IS models, often after heavy rain, road grime buildup, windshield contamination, or minor front-end impacts. The system may temporarily disable with a message indicating the camera or radar is unavailable, even though no permanent hardware failure exists. In other cases, sensor alignment or calibration drift after windshield or bumper work can trigger recurring warnings.
Lexus RX(1 issue)
- Front Camera / Millimeter-Wave Radar Misalignment Causing PCS and Driver-Assist Warnings2023-2025
Owners of the current-generation RX have reported recurring messages such as 'Pre-Collision System Malfunction,' 'Front Camera Unavailable,' or temporary loss of adaptive cruise and lane functions. These complaints appear in NHTSA filings and owner forums, often after windshield replacement, minor impacts, heavy rain, or sometimes with no obvious trigger. The issue is commonly related to camera/radar obstruction, calibration drift, connector faults, or software sensitivity in the Lexus Safety System+ suite.
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View C1A11 across all makes →Frequently Asked Questions
What does C1A11 mean on Lexus?▼
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 Lexus specifically, this code is documented across 2 models.
What causes C1A11 on Lexus vehicles?▼
Common causes on Lexus: 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 Lexus?▼
Repair costs on Lexus range from $250 to $1,800, depending on the specific model and root cause.
Which Lexus models have C1A11 documented?▼
Au7o has documented C1A11 on 2 Lexus models: IS, RX.