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Home >> Isuzu >> 1996 >> Oasis LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P0133 - Front Ho2S Sensor 1
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DTC P0133 - Front Ho2S Sensor 1

NOTE: If DTCs P0131, P0132 and/or P0135 are also present, trouble shoot those DTCs before DTC P0133.
  1. Start engine. Raise and hold engine speed at 3000 RPM with transmission in Park or Neutral, until radiator fan comes on. Let engine idle. Connect SCS Service Connector (07PAZ-0010100) . Test drive vehicle at 55 MPH, with transmission in D4 position (A/T) or 5th gear (M/T), until readiness code comes on.
  2. If DTC P0133 is not indicated, system is functioning properly at this time. Failure is intermittent. Check for poor connections or loose wires at HO2S (sensor 1) and PCM connectors. See WIRING DIAGRAMS  section. Repair as necessary. If DTC P0133 is indicated, replace front HO2S (sensor 1).
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