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DTC P1186: Heated Oxygen Sensor (Ho2S) 3 Or 4 Heater Fault

NOTE: After each repair, clear DTCs. See CLEARING CODES/PCM RESET PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and then on. Read DTCs to verify repair is complete. For DLC and PCM connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  .
NOTE: On 1995 models: HO2S 1 is located downstream of pre-catalytic converter for cylinders No. 1, 2 and 3. HO2S 2 is located downstream of pre-catalytic converter for cylinders No. 4, 5 and 6. HO2S 3 is located upstream of pre-catalytic converter for cylinders No. 1, 2 and 3. HO2S 4 is located upstream of pre-catalytic converter for cylinders No. 4, 5 and 6. On XJ6, HO2S 3 and 4 apply to Federal vehicles only.
NOTE: On 1996-1997 models: There are 2 HO2S "A", one upstream of the pre-catalytic converter and one downstream of the pre-catalytic converter, for cylinders No. 1, 2 and 3. There are 2 HO2S "B", one upstream of the pre-catalytic converter and one downstream of the pre-catalytic converter, for cylinders No. 4, 5 and 6.
  1. Using scan tool, read DTCs. If DTC P1186 is present, turn ignition off. Ensure HO2S harness and connectors are not damaged and connections are okay. Repair as necessary. If harness and connectors are okay, go to next step.
  2. Disconnect both upstream pre-catalytic converter HO2S (No. 3 and 4) harness connectors. Using DVOM, check resistance across each HO2S terminals No. 3 and 4. Resistance should be 10-20 ohms with temperature at -5 to 212°F (-20 to 100°C). If resistance is not within specification, replace HO2S. If resistance is within specification, go to next step.
  3. Check Blue/Brown wire for short circuit to battery voltage between No. 3 and No. 4 HO2S connector terminals No. 3 and PCM Black connector terminal No. 30. Repair wiring as necessary. If wiring is okay, go to next step.
  4. Reconnect HO2S harness connectors. Clear DTCs. Turn ignition off and then on. Read DTCs. If DTC P1186 is not present, repair is complete. If DTC P1186 is present, replace PCM.
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