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 MANUALSBUICK2000PARK AVENUE BASE, 3.8 KREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 3.8LDIAGNOSTIC TESTSDTC P0141: HO2S 2 HEATER PERFORMANCE - BANK 1, SENSOR 2DIAGNOSTIC PROCEDURES
2000 Buick Park Avenue Base, 3.8 K
Diagnostic Procedures
2000 Buick Park Avenue Base, 3.8 KSECTION 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.NOTE: If engine has been operating, allow engine to cool for about 30 minutes before proceeding with tests.
- Turn ignition on, engine off. Using scan tool, read HO2S voltage. If voltage is greater than 0.6 volt (600 mV) or less than 0.3 volt (300 mV), see DIAGNOSTIC AIDS . If voltage is not greater than 0.6 volt (600 mV) or less than 0.3 volt (300 mV), go to next step.
- Inspect HO2S ignition feed fuse. If fuse is open, go to step 15. If fuse is okay, go to next step.
- Disconnect HO2S harness connector. Connect a test light between ground and HO2S ignition feed circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 7.
- Connect test light between HO2S harness connector ignition feed and heater ground circuits. If test light illuminates, go to next step. If test light does not illuminate, go to step 8.
- Allow HO2S to cool for at least 10 minutes. Using DVOM, check resistance between ignition feed and heater ground circuits at HO2S. If resistance is 5-10 ohms, go to step 9. If resistance is not 5-10 ohms, go to step 14.
- Repair open HO2S ignition feed circuit. After repairs, go to step 16.
- Repair open HO2S heater ground circuit. After repairs, go to step 16.
- Check for faulty connection at HO2S. Repair as necessary. After repairs, go to step 16. If connection is okay, go to next step.
- Turn ignition off. Disconnect PCM harness connectors. Measure resistance of HO2S 2 signal and ground circuits. If resistance on either circuit is greater than 5 ohms, repair open or faulty connection as necessary. After repairs, go to step 16. If resistance is 5 ohms or less, go to next step.
- Check for faulty connection at HO2S 2 harness connector. Repair as necessary. After repairs, go to step 16. If connection is okay, go to next step.
- Check for faulty HO2S ground circuit connection at PCM. Repair as necessary. After repairs, go to step 16. If connection is okay, go to next step.
- Check for faulty HO2S signal circuit connection at PCM. Repair as necessary. After repairs, go to step 16. If connection is okay, go to next step.
- Replace HO2S. After replacing sensor, go to step 16.
- Locate and repair short to ground in HO2S ignition feed circuit. Replace fuse and go to next step.
- Allow engine to cool completely. Using scan tool, clear DTCs. Turn ignition on, engine off. Read HO2S voltage. If voltage is greater than 600 mV or less than 300 mV, system is okay. If voltage is not as specified, go to step 2.
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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.