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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LDIAGNOSTIC TESTSDTC P0133: O2S1 CIRCUIT - SLOW RESPONSE (2.4L)DIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedures

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK (GASOLINE)  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. If any other DTCs are set (except O2S DTCs), refer to other DTCs before proceeding with this procedure. Ensure engine is at operating temperature. Operate engine at speeds more than 1200 RPM for 2 minutes. Using scan tool, observe O2S voltage parameter. If scan tool indicates HO2S voltage varying outside 400-500 millivolts, go to next step. If scan tool does not indicate HO2S voltage varying outside 400-500 millivolts, go to step  4 .
  3. Operate vehicle within failure records conditions. If scan tool indicates this DTC failed this ignition cycle, go to next step. If scan tool does not indicate this DTC failed this ignition cycle, see DIAGNOSTIC AIDS  .
  4. Inspect and test for exhaust leak, O2S installed correctly and damaged wiring. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to next step.
  5. Turn ignition off. Disconnect O2S sensor. O2S is located in exhaust manifold. Connect jumper wire between O2S connector terminal "A" (Tan wire) and ground. Turn ignition on, engine off. Using DVOM connected to ground, measure voltage on O2S connector terminal "B" (Purple wire) on PCM side. If voltage is 351-551 millivolts, go to next step. If voltage is not 351-551 millivolts, go to step  8 .
  6. Connect jumper wire between O2S connector terminals. Using scan tool, observe O2 VOLTAGE parameter. If scan tool indicates O2 voltage at or near zero millivolts, go to step  9 . If scan tool does not indicate O2 voltage at or near zero millivolts, go to next step.
  7. Check Tan wire between O2S and PCM for open or high resistance. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to step  11 .
  8. Check Purple wire between O2S and PCM for open or high resistance. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to step  11 .
  9. Check O2S connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to next step.
  10. O2S sensor has been contaminated. Contamination source must be removed prior to operating engine with replacement sensor. Possible sources of contamination include use of an incorrect silicone RTV sealant, engine coolant leakage into combustion chamber, excessive engine oil consumption, use of silicone-contaminated fuel and use of fuel containing lead. Replace O2S sensor. See OXYGEN SENSOR in appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  13 .
  11. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  13 . If problem was not found, go to next step.
  12. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  13. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If scan tool indicates diagnostic ran and passed, go to next step.
  14. Using scan tool, observe stored information. If any DTCs are displayed that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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.