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DTC P0136 - Ho2S No. 2 Circuit Malfunction

  1. Inspect exhaust system for damage or leaks. Repair as necessary. If exhaust system is okay, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). Drive vehicle under normal driving conditions for 5 minutes. Observe HO2S No. 2 output voltage and short term fuel trim using DATA LIST mode on scan tool. Record reading. If HO2S No. 2 output voltage reading is less than 1.275 volts, go to next step. If reading is not as specified, check for open in Light Green/Black wire or Yellow wire between HO2S No. 2 and PCM. Check for faulty HO2S No. 2. Repair as necessary. Retest system.
  3. If short term fuel trim varied between -20 and +20 percent, go to next step. If reading is not as specified, check fuel system following procedures in DTC P0171 and DTC P0172.
  4. Check Light Green/Black wire and Yellow wire for an open or short between HO2S No. 2 and PCM. Repair as necessary. If wires are okay, replace HO2S No. 2. Retest system.
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