Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 37 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L CNG)INSPECTION/MAINTENANCE PROCEDURESINSPECTION/MAINTENANCE HEATED OXYGEN SENSOR/OXYGEN SENSOR SYSTEM SET PROCEDUREDIAGNOSTIC PROCEDURE
2001 Chevrolet Cavalier LS, 2.4 T
Diagnostic Procedure
2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
- If inspection/maintenance system check has been performed, go to next step. If inspection/maintenance system check has not been performed, go to INSPECTION/MAINTENANCE SYSTEM CHECK . After performing inspection/maintenance system check, go to next step.
- Ensure vehicle is within CONDITIONS FOR RUNNING . Turn off all accessories. Start engine and allow to idle. Road test vehicle. For this test to run, accelerate at part throttle to 45-55 MPH. Maintain this speed for 6 minutes or until I/M System Status updates to YES. Vehicles equipped with M/T (5 or 6 speed) may require operation in 4th or 5th gear respectively, for this test to run. Using scan tool, review I/M System Status display. Did the HO2S/O2S System Status update to YES? If yes, go to step 5 . If no, go to next step.
- Using scan tool, monitor DTC Information for both AF ECM and PCM. If scan tool indicates any failed DTC, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. If scan tool does not indicate any failed DTCs, go to next step.
- Using scan tool, monitor NOT RAN SINCE CODE CLEARED display. Determine which HO2S/O2S DTCs required for a YES status, have not run. Enter DTC number in SPECIFIC DTC menu of scan tool. Operate vehicle within CONDITIONS FOR RUNNING . Repeat until scan tool indicates diagnostic test has run. Repeat for any additional required DTCs that have not run. Using scan tool, observe I/M System Status display. If HO2S/O2S System Status updates to YES, go to next step. If HO2S/O2S System Status does not update to YES, go to DIAGNOSTIC AIDS .
- Using scan tool, monitor Emission Related DTC portion of I/M System Status display. Does scan tool indicate any emission related DTCs? If yes, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. If no, 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.