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 MANUALSCHEVROLET1995CAVALIER LS, 4D SEDAN, 2.2 4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 2.3L (W/OBD-II)DIAGNOSTIC TROUBLE CODESDTC P0141 - HO2S HEATER CIRCUIT SENSOR 2DIAGNOSTIC PROCEDURES
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4
Diagnostic Procedures
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4SECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.NOTE: If engine has been operating, turn ignition off and allow engine to cool down for about 1/2 hour before proceeding.
- Turn ignition on, with engine off. Using scan tool, observe HO2S 2 voltage reading. If voltage gradually changes towards zero or one volt, go to DIAGNOSTIC AIDS. If voltage does not gradually change towards zero or one volt, go to next step.
- Disconnect HO2S 2 connector. Connect a test light between ground and ignition feed circuit terminal at HO2S 2 harness connector. If test light is on, go to next step. If test light is off, go to step 5).
- Connect a test light between ground circuit and ignition feed circuit terminals at HO2S 2 harness connector. If test light is on, go to step 6). If test light is off, go to step 7).
- Remove and inspect fuse for HO2S 2 ignition feed circuit. If fuse is blown, go to step 8). If fuse is okay, go to step 9).
- Inspect HO2S 2 harness connector for faulty terminals or poor connection. Repair terminals as necessary. After repair is completed, perform OBD System Check. If connector is okay, go to step 10).
- Inspect HO2S 2 harness connector for faulty terminals or poor connection. Repair terminals as necessary. After repair is completed, perform OBD System Check. If connector is okay, go to step 11).
- Check for short to ground in HO2S 2 ignition feed circuit. Repair wiring as necessary. After repair is completed, replace fuse and perform OBD System Check.
- Inspect HO2S 2 harness connector for faulty terminals or poor connection. Repair terminals as necessary. After repair is completed, perform OBD System Check.
- Replace oxygen sensor. After repair is completed, perform OBD System Check.
- Repair open in ground circuit as necessary. After repair is completed, perform OBD System Check.
- Repair open in ignition feed circuit. After repair is completed, perform OBD System Check.
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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.