B1791 Code – Autolamp Sensor Input Circuit Open

What are the Possible Causes of the Code B1791?
  • Faulty Light Sensor
  • Light Sensor harness is open or shorted
  • Light Sensor circuit poor electrical connection
  • Faulty Headlamp Switch
  • 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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