Does C1A16 mean the laser/radar sensor has failed?

No. On Nissan vehicles, C1A16 reports “Radar stain,” which points to obstruction or blocked operation. That message identifies a suspected trouble area, not a failed part. Prove the cause first by inspecting the sensor viewing surface and mounting, then verifying stable power and ground with a loaded test.

Do I need calibration after cleaning or repairing the radar area?

Cleaning alone usually does not require calibration if you never move the sensor or bracket. Any change to the sensor position, bracket, bumper structure, or sensor replacement can require calibration or initialization on the Leaf. Use Nissan-capable scan tooling and the correct setup procedure. Confirm completion by checking ADAS status and no returning DTCs.

How do I confirm the repair is complete and the code will not return?

Clear the DTC only after you correct the cause. Then road test long enough for the laser/radar self-check to run. Enable criteria vary by Nissan platform and conditions. Speed, weather, and traffic targets can matter. Monitor live data for “obstruction” or “blocked” status changes, and confirm no pending codes after several drive cycles.

Will my scan tool still communicate with the laser/radar module when C1A16 sets?

Most of the time, yes. C1A16 typically sets when the module stays online but reports blocked operation. If the scan tool cannot communicate with the laser/radar module, treat that as a different diagnostic path. Check module power, ground, and network wiring first. A communication loss points away from “stain” and toward circuit or network faults.

Can weather alone trigger C1A16 on a Nissan Leaf?

Yes. Heavy rain, wet road spray, slush, snow, or ice can temporarily block the sensor view and set C1A16. That does not confirm a defect. Verify whether the code clears after conditions improve and after cleaning the sensor area. If it returns in dry conditions, inspect for bumper damage, misalignment, or electrical integrity issues.

C1A16 Nissan – Radar stain (Component or system operation

C1109 Battery voltage
C1145 Yaw rate sensor
C1705 Low pressure (right front)
C1706 Low pressure (right rear)
C1707 Low pressure (left rear)
C1B00 Camera unit malf
C1B40 Side radar (right) fault
C1B52 Right blind spot warning (BSW)/blind spot intervention (BSI) indicator…

View all Nissan codes →

Browse by System

Powertrain (P-Codes)
Body (B-Codes)
Chassis (C-Codes)
Network (U-Codes)

More Nissan Codes

Powertrain Systems

More Systems

Safety & Chassis

Chassis & Network