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Home >> Toyota >> 1997 >> RAV4 2D Utility, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Oxygen Sensor
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Oxygen Sensor

  1. Two oxygen sensors are used. One oxygen sensor is on exhaust manifold before front catalytic converter. This oxygen sensor is referred to as the No. 1 or front oxygen sensor. Another oxygen sensor is located on bottom of front catalytic converter. This oxygen sensor is referred to as the No. 2 oxygen sensor or the rear oxygen sensor.
  2. If problem exists with either oxygen sensor, a diagnostic trouble code will be stored in Engine Control Module (ECM). For diagnostic trouble code diagnosis, see TESTS W/CODES article.
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