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Home >> Chevrolet >> 1996 >> Monte Carlo LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.1L Engine >> Diagnostic Trouble Codes >> DTC P0133 - Ho2S Slow Response Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
    NOTE: If other DTCs are present, diagnose affected DTC(s) before proceeding.
  2. Start engine. Ensure engine is at normal operating temperature. Operate vehicle within the conditions required for setting this DTC. Monitor SPECIFIC DTC info for DTC P0133 until DTC P0133 test runs. If scan tool indicates FAILED THIS IGN, go to next step. If scan tool does not indicate FAILED THIS IGN, see DIAGNOSTIC AIDS.
  3. If scan tool also indicates DTC P1133 or P1134, go to step 8). If scan tool does not also indicate DTC P1133 or P1134, go to next step.
  4. Check for exhaust leaks. Repair as necessary. After repair is completed, go to step 13). If exhaust is okay, go to next step.
  5. Perform the following:
    • Check for proper HO2S 1 installation.
    • Check HO2S 1 connector and wiring for corrosion or damage.
    • Check HO2S 1 ground circuit.

    If a problem is found, go to step 9). If no problems were found, go to next step.

  6. Disconnect HO2S 1 connector. Connect a jumper wire between ground and ground circuit terminal at HO2S 1 harness connector. Turn ignition on. Using scan tool, monitor 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 ground and signal circuit terminal at HO2S 1 harness connector. If voltage is less than 300 mV, go to step 12). If voltage is 300 mV or greater, go to step 11).
  8. Replace oxygen sensor. Determine cause of sensor contamination, otherwise new sensor will be damaged. After repair is completed, go to step 13).
  9. Repair or replace wiring or terminal as necessary. DO NOT attempt to repair damaged oxygen sensor connector or wiring. If damage is detected, replace oxygen sensor. After repair is completed, go to step 13).
  10. Repair open in HO2S 1 ground circuit or grounded HO2S 1 signal circuit. After repair is completed, go to step 13).
  11. Repair open in HO2S 1 signal circuit. If circuit is okay, check PCM connections. After repair is completed or if repairs are not required, go to step 13).
  12. Replace HO2S 1. After repair is completed, go to next step.
  13. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P0133 until DTC P0133 test runs. If scan tool indicates FAILED THIS IGN, repeat step 2). If scan tool does not indicate FAILED THIS IGN, repair is complete.
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