C1A11: Front Radar Sensor Incorrect Axial Gap (Beam Axis Misalignment)
3 vehicles · 2 makes · $250-$1,800 repair
Most Reported On
C1A11 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2024-2025 Toyota Land Cruiser, 2023-2025 Lexus IS, and 2023-2025 Lexus RX, with repair costs ranging from $250 to $1,800.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C1A11, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (3)
FAQ
What does C1A11 mean?
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.
What are the most common causes of C1A11?
The most common causes of C1A11 are: 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. The specific cause varies by vehicle.
How much does it cost to fix C1A11?
Repair costs for C1A11 range from $250 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by C1A11?
Au7o has documented C1A11 across 3 vehicle models from 2 manufacturers: Lexus, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.