P0054/P0055/P0060/P0061 Heater Resistance

• 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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