16804/P0420/001056

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16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

Possible Causes

  • Oxygen Sensor(s) defective
  • Oxygen Sensor(s) Control defective

Possible Solutions

  • Check Oxygen Sensor(s)
  • Check Oxygen Sensor(s) Control
  • Perform Oxygen Sensor(s) Aging Check
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