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 MANUALSCHEVROLET2000CAVALIER BASE, 2D COUPE, AUTOMATIC, 4T40E/MN4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LDIAGNOSTIC TESTSDTC P0140: HO2S 2 CIRCUIT - INSUFFICIENT ACTIVITYDIAGNOSTIC PROCEDURES
2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4
Diagnostic Procedures
2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4SECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
- Ensure engine is at normal operating temperature. Start engine. Increase engine speed to 1200 RPM for 2 minutes. Observe HO2S 2 voltage. If voltage is 425-460 mV, go to step 4 . If voltage is not 425-460 mV, go to next step.
- 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. Observe HO2S 2 voltage. If voltage is 425-460 mV, go to next step. If voltage is not 425-460 mV, go to step 11 .
- Turn ignition on, with engine off. Disconnect HO2S 2 harness connector. Connect a jumper wire between ground and signal circuit and ground circuit terminals at HO2S 2 harness connector. If voltage is less than 100 mV, go to next step. If voltage is not less than 100 mV, go to step 6 .
- Turn ignition off. Check for open or poor connection at HO2S 2 harness connector. Repair as necessary. After repairs, go to step 11 . If circuit is okay, go to step 7 .
- Turn ignition off. Remove jumper wire. Using a test light connected to battery positive, probe ground circuit at HO2S 2 harness connector. If test light illuminates, go to step 8 . If test light does not illuminate, go to step 9 .
- Replace HO2S 2. After repairs, go to step 11 .
- Check HO2S 2 signal circuit for an open or poor connection. Repair as necessary. After repairs, go to step 11 . If circuit is okay, go to step 10 .
- Repair open in HO2S 2 ground circuit. After repairs, go to step 11 .
- Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
- Using scan tool, clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function, and then enter DTC P0140. If scan tool indicates this test ran and passed, go to next step. If scan tool does not indicate this test ran and passed, go to step 2 .
- If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, 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.