There is a factory service bulletin for all Infiniti models to help diagnose the C1104 code:
2007-2013 All Infiniti Models:
2007-2013 All Infiniti Models Factory Service Bulletin OBDII Code C1104
Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the C1104 Infiniti code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
When the sensor rotor rotates, the magnetic field changes. It converts the magnetic field changes to current signals (rectangular waves) and transmits them to the Anti-Lock Brake System (ABS) Actuator and Electric Unit (Control Unit). The ABS Actuator and Electric Unit monitor the ABS Wheel Sensor. The ABS Actuator and Electric Unit sets the OBDII code when the ABS Wheel Sensor is not to factory specifications. The Diagnostic Trouble Code (DTC) will be set when the circuit of the front Left wheel sensor is open or shorted or the sensor power voltage is unusual.
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