C0021 Code – Brake Booster Performance

What are the Possible Causes of the Code C0021?
  • Faulty Brake Booster
  • Faulty Vacuum Pressure Sensor
  • Vacuum Pressure Sensor harness is open or shorted
  • Vacuum Pressure 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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