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Home >> Toyota >> 2004 >> Matrix Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 110 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0136: Oxygen Sensor Circuit Fault (Bank 1 Sensor 2) Or DTC P0156: Oxygen Sensor Circuit Fault (Bank 2 Sensor 2) >> Diagnosis & Repair
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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. If any other DTCs are displayed, diagnose and repair those DTCs first. If only DTC P0136 or P0156 is displayed, go to next step.
  2. Check for open or short in wiring between ECM and appropriate heated oxygen sensor No. 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  3. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Start and warm engine to normal operating temperature. Increase engine speed to 2500 RPM for about 3 minutes. Monitor appropriate heated oxygen sensor No. 2 output voltage. Snap accelerate engine to about 4000 RPM 3 times. Voltage should fluctuate from less than .4 volt to .5 volt or more. If voltage is as specified, problem is intermittent. Check component and ECM connections. If voltage is not as specified, replace heated oxygen sensor No. 2.
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