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 C1421 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.
The Master Cylinder Pressure Sensor is connected to the Skid Control ECU (Brake Actuator Assembly). The Skid Control ECU monitors the Master Cylinder Pressure Sensor. The Skid Control ECU sets the Diagnostic Trouble Code (DTC) when the Master Cylinder Pressure Sensor is not to factory specifications.
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