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DTC P0133: Primary Ho2S-1 Sensor Slow Response

NOTE: If DTCs P0131, P0132 and/or P0135 are set with P0133, trouble shoot DTC P0133 last.
NOTE: DTC P0133 is set and MIL illuminated when deterioration of HO2S-1 has been detected during 2 consecutive trips.
  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DTCS in SELF-DIAGNOSTICS - INTRODUCTION article. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on. Allow engine to idle. Connect SCS Service Connector to 2-pin service check connector. See Figure . Test drive vehicle at 55 MPH, with transmission in No. 4 position (A/T) or 5th gear (M/T), until readiness code comes on.
  2. If DTC P0133 is not indicated, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at HO2S-1 and PCM connectors. Also check poor connections or loose wires at C282 connector, located at right shock tower. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If DTC P0133 is indicated, replace primary HO2S-1.
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