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Home >> Buick >> 2000 >> Regal LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0133: HO2S SLOW RESPONSE - BANK 1, SENSOR 1 (EXCEPT BONNEVILLE, CAMARO, FIREBIRD & LeSABRE) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. If any other HO2S related DTCs (except P1133 or P1134) are set, diagnose affected DTCs. Start and warm engine to normal operating temperature. Operate vehicle within conditions required to set DTC. Using scan tool, read SPECIFIC DTC. If scan tool indicates that this DTC FAILED THIS IGN, go to next step. If scan tool does not indicate that this DTC FAILED THIS IGN, see DIAGNOSTIC AIDS .
  3. If scan tool also displays DTC P1133 or P1134 FAILED THIS IGN, go to step  8. If scan tool does not indicate that this these DTCs, go to next step.
  4. Visually inspect exhaust system for leaks near HO2S. Repair as necessary. After repairs, go to step  13. If no leaks are found, go to next step.
  5. Visually inspect HO2S 1 for secure installation or corrosion on terminals. Check terminal tension at HO2S 1 and PCM. Check for damaged wiring. If a problem is found, go to step  9. If no problem is found, go to next step.
  6. Disconnect HO2S 1 connector. Connect a jumper wire between HO2S 1 harness connector low signal circuit and chassis ground. Using scan tool, read HO2S 1 voltage. If voltage is about 450 mV, go to next step. If voltage is not about 450 mV, go to step  10.
  7. Connect a jumper wire between chassis ground and HO2S 1 harness connector high and low signal circuits. If voltage is less than 300 mV, go to step  12. If voltage is not less than 300 mV, go to step  11.
  8. Repair condition causing fuel, sealant, oil or coolant contamination. Replace affected HO2S. After repairs, go to step  13.
  9. Repair condition as necessary. After repairs, go to step  13.
  10. Repair open in HO2S 1 low signal circuit or grounded HO2S 1 high signal circuit. After repairs, go to step  13.
  11. Repair open in HO2S 1 high signal circuit or faulty PCM connections as necessary. After repairs, go to step  13.
  12. Replace HO2S 1. After replacing sensor, go to next step.
  13. Using scan tool, read and record FAILURE RECORDS data, and clear DTCs. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, select SPECIFIC DTC INFO for this DTC. If scan tool indicates that this DTC FAILED THIS IGN, go to step  2. If scan tool does not indicate that this DTC FAILED THIS IGN, system is okay.
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