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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) - Diagnostics (2AZ-FE)) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Conditioning A/F Sensor And Heated Oxygen Sensor For Testing

Conditioning A/F Sensor And Heated Oxygen Sensor For Testing

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Fig 1: A/F Sensor And Heated Oxygen Sensor Testing Criteria
G02907905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
  2. Start the engine and warm it up with all the accessories switched OFF until the Engine Coolant Temperature (ECT) is stable.
  3. Run the engine at 2,500 to 3,000 rpm for about 3 minutes.
  4. When alternating the engine between 3,000 rpm for 2 seconds and 2,000 rpm for 2 seconds, check the waveform of the oxygen sensor (bank 1 sensor 2).