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Oxygen Sensor Heater

  1. Disconnect electrical connector from oxygen sensor. Using ohmmeter, measure resistance between sensor terminals +B and HT. See Fig 1.
  2. Replace oxygen sensor if resistance is not within specification. See OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS  table.
OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS

Application Ohms
Land Cruiser 5.0-6.5 @ 68°F (20°C)
Fig 1: Testing Oxygen Sensor Heater
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