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Home › Pontiac › 1996 › Trans Sport › Repair and Diagnosis › Engine Performance › System › Engine Control System - Tests W/Codes › Diagnostic Trouble Codes › DTC P0133 - Ho2S Slow Response Sensor 1 › Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. If any other HO2S DTCs (except P1133 or P1134) are set, diagnose affected DTCs. Start engine and allow it to reach operating temperature. Operate vehicle within conditions required to set DTC. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0133 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0133 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 display these DTCs, go to next step.
  4. Visually inspect exhaust system for leaks near HO2S 1. If leaks are found, repair as necessary and return to step 2). 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 jumper wire between HO2S 1 harness connector ground circuit and chassis ground. Using scan tool, read HO2S 1 voltage. If voltage is about 0.45 volt, go to next step. If voltage is not as specified, go to step 10).
  7. Connect a jumper wire between HO2S 1 harness connector signal and ground circuits, and chassis ground. If voltage is less than 0.3 volt, go to step 12). If voltage is 0.3 volt or greater, go to step 11).
  8. Repair condition causing fuel, sealant, oil or coolant contamination. Replace affected HO2S and go to step 13).
  9. Repair condition as necessary and go to step 13).
  10. Repair open HO2S 1 ground circuit or HO2S 1 signal circuit shorted to ground, and go to step 13).
  11. Repair open HO2S 1 signal circuit or faulty PCM connections as necessary, and go to step 13).
  12. Replace HO2S 1 and go to next step.
  13. Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P0133. If scan tool displays DTC P0133 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P0133 FAILED THIS IGN, repair is complete.
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