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DTC P1195: 1/1 O2 Sensor Slow During Catalyst Monitor: Testing

NOTE: 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold. 1/1 catalytic converter is located in right exhaust pipe.
  1. Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP counter is displayed and displayed count is "0", go to next step. If GLOBAL GOOD TRIP counter is not displayed or displayed count is not "0", go to step  7.
  2. Start engine and allow it to idle. Check exhaust system for leaks between engine and 1/1 catalytic converter. Repair exhaust system as necessary. If exhaust system is okay, go to next step.
  3. Ensure coolant is at normal operating temperature. With engine running, inspect exhaust system for excessive smoke caused by oil or coolant consumption. If an oil or coolant consumption condition is not present, go to next step. If an oil or coolant consumption condition is present, repair engine as necessary and replace 1/1 HO2S.
  4. Turn ignition off. Using a voltmeter, backprobe Black/Orange wire between 1/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. See Figure. Start engine and allow it to reach normal operating temperature. Observe voltmeter. If voltage drop is less than .1 volt, go to next step. If voltage drop is .1 volt or more, repair poor connection causing high resistance on 1/1 HO2S ground circuit (Black/Orange wire) between 1/1 HO2S and PCM. See WIRING DIAGRAMS article.
  5. Turn ignition off. Using a voltmeter, backprobe Black/Dark Green wire between 1/1 HO2S connector and terminal No. 30 at PCM C1 harness connector. Start engine and allow it to reach normal operating temperature. Observe voltmeter. If voltage drop is less than .1 volt, go to next step. If voltage drop is .1 volt or more, repair poor connection causing high resistance on 1/1 HO2S signal circuit (Black/Dark Green wire) between 1/1 HO2S and PCM. See WIRING DIAGRAMS article.
  6. At this time, 1/1 HO2S is assumed to be defective. Replace 1/1 HO2S.
  7. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors. Start engine. Wiggle 1/1 HO2S connector and wiring harness while monitoring scan tool display. If GLOBAL GOOD TRIP counter display count changes to "0", repair connector or wiring harness where wiggling caused display to change. If GLOBAL GOOD TRIP counter display count does not change to "0", no problem is indicated at this time. Check for any related technical service bulletins that may apply.
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