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DTC P0136: Heated Oxygen Sensor (Ho2S) No. 2 Circuit Malfunction

  1. Connect scan tool to Data Link Connector (DLC). Drive vehicle for at least 2 minutes at 35 MPH or greater. While revving engine, observe HO2S No. 2 parameter on scan tool display. If scan tool displays zero volts, go to next step. If scan tool displays 0-1 volt, check for an intermittent problem. See TESTS W/O CODES article. If scan tool displays greater than one volt, go to step 4).
  2. Turn ignition off. Disconnect HO2S No. 2 harness connector. Start engine. Using DVOM, measure voltage between terminals No. 1 and 2 of HO2S No. 2 while revving engine. See Figure . If voltage is 0.1-0.9 volt, go to next step. If voltage is not as specified, replace HO2S No. 2 and retest system.
  3. Check circuits between terminals No. 1 and 2 of HO2S No. 2 and PCM for an open or short to ground. Repair as necessary. If circuits are okay, replace PCM and retest system.
  4. Turn ignition off. Disconnect HO2S No. 2 harness connector. Turn ignition on. Observe HO2S No. 2 parameter on scan tool display. If scan tool displays zero volts, replace HO2S No. 2. If scan tool display is not as specified, go to next step.
  5. Check circuit between terminal No. 2 of HO2S No. 2 and PCM for a short to power. Repair as necessary. If circuit is okay, replace PCM and retest system.
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