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P0036/P0042/P0056/P0062 Heater Control Circuit

  • Ensure the oxygen sensor’s heater circuit element is within the OEM’s specifications.
  • If using the heater circuit simulator included with the iO2SS, ensure it is connected to the correct wires.
  • Inspect the wiring harness for open or short circuits.
  • Ensure the oxygen sensor heater circuit’s fuse isn’t blown.
  • If this problem persists, there may be a problem with the engine control unit (ECU).

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