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DTC P0134: Heated Oxygen Sensor (Ho2S) No. 1 Circuit Activity Insufficient

  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. 1 parameter on scan tool display. If scan tool displays 0.45 volt or greater, check for an intermittent problem. See TESTS W/O CODES article. If scan tool display is not as specified, go to next step.
  2. Turn ignition off. Disconnect HO2S No. 1 sensor harness connector. Using DVOM, measure voltage between terminals No. 1 and 2 of HO2S No. 1 harness connector while repeatedly revving engine. See Figure . If voltage is 0.45 volt or greater, go to next step. If voltage is not as specified, replace HO2S No. 1 and retest system.
  3. Check Red/Blue wire between HO2S No. 1 and PCM for a short to ground. Repair as necessary. If wire is okay, replace PCM and retest system.
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