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Home › Pontiac › 2003 › Vibe Base, AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - Self-Diagnostics › Diagnostic Tests › DTC P0133: Ho2S 1 Slow Response › Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Use scan tool to clear DTCs. Using scan tool, place vehicle into CHECK MODE. See SERVICE BAY TESTS  under SELF-DIAGNOSTIC SYSTEM. Operate vehicle within freeze frame conditions as specified, or until HO2S/O2S test is complete. Did DTC P0133 set? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  3. Visually and physically Check the following items:
    • HO2S 1 is securely installed.
    • Any corrosion on terminals.
    • Proper terminal tension at HO2S 1 and at PCM.
    • Any damaged wiring.
    Repair as necessary. Was a repair necessary? If yes, go to step  11. If no, go to next step.
  4. Check exhaust system for an exhaust leak near engine. Repair as necessary. Was an exhaust leak found? If yes, go to step  11. If no, go to next step.
  5. Disconnect HO2S 1 4-pin harness connector, located behind front floor console. Turn ignition switch to RUN position, engine OFF. Set a DVOM to measure DC millivolts (mV). Place positive lead of DMM on positive battery voltage, and negative lead on HO2S 1 sensor input circuit terminal on engine harness side. Observe HO2S 1 parameter on scan tool. Is the voltage more than 1155 mV? If yes, go to next step. If no, go to step  7.
  6. Connect a test light to battery voltage. Probe the HO2S 1 ground circuit terminal at the HO2S connector on the engine harness side. Does the test light illuminate? If yes, go to step  9. If no, go to step  8.
  7. Check for an open or a short in HO2S 1 input circuit between HO2S 1 and PCM connector. Repair as necessary. Was a repair necessary? If yes, go to step  11. If no, go to step  10
  8. Repair open in HO2S 1 ground circuit between HO2S 1 and ground point G104. After repair, go to step  11.
  9. Check for, and repair any possible causes of HO2S contamination including the following possible causes:
    • Fuel contamination.
    • Use of an improper RTV sealant.
    • Engine oil or coolant consumption.
    Replace HO2S 1. After repair, go to step  11.
  10. Replace PCM. After repair, go to next step.
  11. Use scan tool to clear DTCs. Turn ignition OFF for 30 seconds. Start engine. Operate vehicle within CONDITIONS FOR RUNNING DTC  or until HO2S/O2S test is complete. Did DTC run and pass? If yes, go to next step. If no, go to step  2.
  12. Using scan tool, observe stored information, CAPTURE INFO. Does scan tool display any DTCs that have not been diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, system is okay at this time.
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