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DTC P0133: Primary Ho2S-1 Slow Response

NOTE: If DTC P0131, DTC P0132 and/or DTC P0135 are indicated, 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 SELF-DIAGNOSTICS - INTRODUCTION article. Connect scan tool. 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 (07PAZ-0010100). Test drive vehicle at 55 MPH with transmission in Drive position and overdrive on (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. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If DTC P0133 is indicated, replace HO2S-1.
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