C1331 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C1331 – Open In Front Speed Sensor Left
C1331 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C1331 Possible Causes
Faulty Front Speed Sensor Left,Front Speed Sensor Left harness is open or shorted,Front Speed Sensor Left circuit poor electrical connection,Faulty Skid Control ECU (Brake Actuator Assembly)
Each speed sensor detects wheel speed and sends the appropriate signals to the Skid Control ECU. These signals are used by the ABS control system. The speed sensor rotors have 48 serrations. Hall IC type speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.