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Home >> Toyota >> 1998 >> RAV4 Base, 2D Utility, AWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Tests W/Codes >> Self-Diagnostic Tests >> DTC P0136: Oxygen Sensor Circuit >> Diagnosis & Repair
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Diagnosis & Repair

  1. If any codes are displayed other than DTC P0136, diagnose and repair those codes first. If only DTC P0136 is displayed, check for open or short circuit in wiring harness between ECM and oxygen sensor No. 2. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary.
  2. If wiring harness is okay, connect scan tool. See Figure. Start and warm engine to normal operating temperature. Using scan tool, monitor sensor No. 2 output voltage. Snap accelerate engine to about 4000 RPM 3 times. Voltage should fluctuate from less than .4 volt to more than .6 volt.
  3. If voltage fluctuates as specified, check harness connection. Problem may be intermittent. If voltage does not fluctuate as specified, replace oxygen sensor.
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