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HOMESERVICE MANUALSCHEVROLET1999MONTE CARLO LS, 3.8 KREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0100-P0134DTC P0133DTC P0133: HO2S CIRCUIT-SLOW RESPONSE-BANK 1, SENSOR 1 (5.7L "F" & "Y" BODIES)DIAGNOSTIC PROCEDURES
1999 Chevrolet Monte Carlo LS, 3.8 K

Diagnostic Procedures

1999 Chevrolet Monte Carlo LS, 3.8 KSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
    2. NOTE: If other DTCs are present, diagnose affected DTCs first.
  2. Start and warm engine to normal operating temperature. Using scan tool, select ENGINE 1 DATA LIST and operate vehicle within parameters when DTC was set. Using scan tool, select DTC INFO and monitor FAIL THIS IGN data. If scan tool indicates that DTC P0133 test failed, go to next step. If scan tool does not indicate that DTC P0133 test failed, see DIAGNOSTIC AIDS .
  3. If scan tool also indicates that P0153 test failed, go to step  8. If scan tool does not indicate that P0153 test failed, go to next step.
  4. Check exhaust system for leaks. Repair as necessary. After repairs, go to step  14. If exhaust is okay, go to next step.
  5. Ensure Bank 1 HO2S 1 is securely installed. Check terminals for corrosion or damaged wiring. Repair as necessary. After repairs, go to step  14. If wiring and terminals are okay, go to next step.
  6. Disconnect Bank 1 HO2S 1. Connect a fused Jumper wire between ground and PCM connector (PCM side), HO2S low signal circuit. Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If HO2S voltage is 350-550 mV, go to next step. If HO2S voltage is not as specified, go to step  10.
  7. Connect a fused jumper wire between ground and PCM connector (PCM side), Bank 1 HO2S 1 high and low signal circuits. Using scan tool, monitor voltage. If voltage is less than 200 mV, go to step  13. If voltage is not less than 200 mV, go to step  9.
  8. Replace HO2S. Determine cause of sensor contamination, otherwise new sensor will be damaged. After repairs, go to step  14.
  9. Remove jumper wire from HO2S low signal circuit. Measure voltage between HO2S low signal circuit and battery ground. If voltage is about 5 volts, go to step  12. If voltage is not about 5 volts, go to step  11.
  10. Repair HO2S high signal circuit for short to ground or short to voltage. After repairs, go to step  14.
  11. Repair open in HO2S low signal circuit or faulty PCM connections. After repairs, go to step  14.
  12. Repair open in HO2S high signal circuit or faulty PCM connections. After repairs, go to step  14.
  13. Replace Bank 1 HO2S 1 sensor. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter DTC P0133. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
RENDER: 1.0x

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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.