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C1221 Code – Left Front Wheel Speed Sensor Input Signal Is Zero

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What are the Possible Causes of the Code C1221?
  • Faulty Hub Assembly (Left Front Wheel Speed Sensor is part of hub assembly)
    • Faulty Left Front Wheel Speed Sensor
  • Left Front Wheel Speed Sensor harness is open or shorted
  • Left Front Wheel Speed Sensor circuit poor electrical connection

    • Need help with this OBD II code? Our mechanics are available within west Michigan to help. Outside of our service area? Visit our Car Help Section where you can ask questions and get answers.

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