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B0101 Code – Driver-Side EFS Not Okay Message

What are the Possible Causes of the Code B0101?
  • Faulty Driver-Side Electronic Frontal Sensor (EFS)
  • Driver-Side Electronic Frontal Sensor (EFS) harness is open or shorted
  • Driver-Side Electronic Frontal Sensor (EFS) circuit poor electrical connection
  • Faulty Sensing and Diagnostic Module (SDM)
  • 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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