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 P0130: O2S 1 CIRCUIT CLOSED-LOOP PERFORMANCE (2.4L "J" & "N" BODIES)DIAGNOSTIC 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.
- Turn ignition on, with engine off. Using scan tool, check for DTCs. If any other DTCs are set, diagnose affected DTC(s) first. Start and operate engine at 1200 RPM or greater for 2 minutes. Using scan tool, observe HO2S voltage parameter. Voltage reading should be varying within a range of 400-500 mV. If voltage reading is varying outside of specified value, go to next step. If voltage reading is varying within the specified value, go to step 4
- Operate vehicle within the Fail Safe Records conditions. If scan tool indicates that this DTC failed in this ignition cycle, go to next step. If scan tool does not indicate that this DTC failed in this ignition cycle, see DIAGNOSTIC AIDS .
- Check for exhaust leaks, improperly installed HO2S or damaged sensor wiring. Repair as necessary. After repairs, go to step 13 . If no problems were found, go to next step.
- Turn ignition off. Disconnect oxygen sensor harness connector. Turn ignition on, with engine off. Using a DVOM, check voltage between chassis ground and HO2S signal circuit at harness connector. If voltage reading is about 450 mV, go to next step. If voltage reading is not about 450 mV, go to step 8
- Connect a jumper wire between HO2S harness connector terminals. Using scan tool, monitor HO2S voltage. If voltage reading is about zero millivolt, go to step 9 . If voltage reading is not about zero millivolt, go to next step.
- Check HO2S low circuit for open or high resistance. Repair as necessary. After repairs, go to step 13 . If circuit is okay, go to step 11 .
- Check HO2S signal circuit for open or high resistance. Repair as necessary. After repairs, go to step 13 . If circuit is okay, go to step 11 .
- Check for poor connections at HO2S connectors. Repair as necessary. After repairs, go to step 13 . If connections are okay, go to next step.
- Check for alcohol contaminated fuel or improper use of RTV sealant, affecting HO2S. Repair cause of contamination and replace HO2S. After repairs, go to step 13 .
- Check for poor connections at PCM. Repair as necessary. After repairs, go to step 13 . If connections are okay, go to next step.
- 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 this DTC. 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.