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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Engine Control System Self-Diagnostics - V6) >> Diagnostic Tests >> DTC P0136: Heated Oxygen Sensor Circuit >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using Toyota hand-held tester or scan tool, check for any other DTCs. If only DTC P0136 exists, go to next step. If other DTCs exist, diagnose and repair those DTCs first and retest.
  2. Check for open and short in wiring harness and electrical connectors between heated oxygen sensor and ECM. See WIRING DIAGRAMS article. Heated oxygen sensor is located on exhaust pipe, behind catalytic converter. ECM is located behind glove box and heater duct. See Figure. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector is defective, repair as necessary.
  3. With hand-held tester or scan tool still connected to DLC No. 3, start engine and warm engine to normal operating temperature. Monitor heated oxygen sensor output voltage while quickly accelerating engine to 4000 RPM 3 consecutive times. Output voltage should fluctuate from .40 volt or less to .50 volt or more. If output voltage is within specification, problem is intermittent. Check for defective connections or intermittent problem in wiring between heated oxygen sensor and ECM. If output voltage is not within specification, replace heated oxygen sensor. See HEATED OXYGEN SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. If output voltage is within specification, problem is intermittent. Check for defective connections or intermittent problem in wiring between heated oxygen sensor and ECM.
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