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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P0136: Heated Oxygen Sensor Circuit (Bank No. 1 Sensor No. 2) >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Sienna. 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 (bank No. 1 sensor No. 2) and ECM. See WIRING DIAGRAMS article. Heated oxygen sensor (bank No. 1 sensor No. 2) is located on exhaust pipe behind catalytic converter. ECM is located at passenger's side of instrument panel, just below glove box. 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 (bank No. 1 sensor No. 2) output voltage while quickly accelerating engine to 4000 RPM 3 consecutive times. Output voltage should fluctuate from .40 volt or less to .60 volt or more. If output voltage is not within specification, replace heated oxygen sensor (bank No. 1 sensor No. 2). 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 (bank No. 1 sensor No. 2) and ECM.
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