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HOMESERVICE MANUALSBUICK2000PARK AVENUE BASE, 3.8 1REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 3.8LDIAGNOSTIC TESTSDTC P1133: HO2S INSUFFICIENT SWITCHING - BANK 1, SENSOR 1 (CAMARO & FIREBIRD)DIAGNOSTIC PROCEDURES
2000 Buick Park Avenue Base, 3.8 1

Diagnostic Procedures

2000 Buick Park Avenue Base, 3.8 1SECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
    NOTE: Diagnose any other DTCs that are set before proceeding with this step.
  2. Warm engine to normal operating temperature. Operate engine at greater than 1200 RPM for 2 minutes. Using scan tool, observe HO2S voltage parameter. If HO2S voltage is varying outside of 400-500 mV range, go to next step. If HO2S voltage is not varying outside of 400-500 mV range, go to step  4.
  3. Operate vehicle within FAIL RECORDS conditions. Check for DTCs. If scan tool indicates that this DTC failed this ignition, go to next step. If scan tool does not indicate that this DTC failed this ignition, see DIAGNOSTIC AIDS .
  4. Check exhaust system for leaks. Check for proper HO2S installation. Repair as necessary. After repairs, go to step  15. If no problem is found, go to next step.
  5. Disconnect HO2S harness connector. Connect a jumper wire between ground and HO2S signal circuit at harness connector. Using scan tool, observe HO2S voltage. If voltage reading is greater than 400 mV, go to next step. If voltage reading is not greater than 400 mV, go to step  10.
  6. Remove jumper wire. Using a DVOM, connect DVOM between ground and HO2S signal circuits at harness connector. If voltage reading is about 4.5 volts, go to next step. If voltage reading is not about 4.5 volts, go to step  9.
  7. Check voltage between ground and HO2S low circuit. If voltage reading is about 5 volts, go to step  11. If voltage reading is not about 5 volts, go to next step.
  8. Check HO2S low circuit for open or high resistance. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  13.
  9. Check HO2S signal circuit for open or high resistance. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  13.
  10. Check HO2S low circuit for short to ground. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  14.
  11. Check for poor connections at HO2S. Repair as necessary. After repairs, go to step  15. If connections are okay, go to next step.
  12. Check cause of fuel contamination or improper RTV use. Repair as necessary. After repairs, go to step  15.
  13. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  15. If connections are okay, go to next step.
  14. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  15. Using scan tool, read and record FAILURE RECORDS DATA. 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, go to next step.
  16. Using scan tool, recheck DTCs. If any other DTCs are set, diagnose affected DTCs. If no other DTCs are set, system is okay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.