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DTC P0134 - Ho2S No. 1 Circuit/No Activity Detected

NOTE: If any DTCs besides DTC P0134, P0171 or P0172 are set, diagnose them first
  1. Connect scan tool to Data Link Connector (DLC). Start engine and allow it to reach normal operating temperature. Increase engine speed to 2000 RPM and release to idle. Repeat 5-6 times continuously while monitoring HO2S No. 1 parameter on scan tool. If display reading varies from less than 0.3 volt to greater than 0.6 volt, follow procedures in DTC P0171 and DTC P0172. If display reading is not a specified, go to next step.
  2. Check Red wire and Light Green/Black wire between HO2S No. 1 and PCM for an open or short. Repair as necessary. If wires are okay, replace HO2S No. 1. Retest system.
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