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P1647 – Heated Oxygen Sensor Heater Control (Bank 1 Sensor 2)

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Symptoms

  • Poor fuel economy
  • Slow sensor response

Causes

  • Heater failure
  • Wiring issue
  • Blown fuse

Diagnosis

  • Measure heater resistance
  • Inspect wiring
  • Check fuse

Repair

  • Replace O2 sensor
  • Repair wiring
  • Replace fuse
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