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HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 3.1LDIAGNOSTIC TROUBLE CODESDTC P0141 - HO2S HEATER CIRCUIT SENSOR 2DIAGNOSTIC PROCEDURES
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4

Diagnostic Procedures

1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Diagnostic Procedures
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. 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.
  2. Turn ignition on, engine off. Using scan tool, read HO2S 2 voltage. If voltage is greater than 600 mV or less than 300 mV, see DIAGNOSTIC AIDS. If voltage is not as specified, go to next step.
  3. Inspect HO2S 2 ignition feed fuse. If fuse is open, go to step 15). If fuse is okay, go to next step.
  4. Turn ignition off. Raise and support vehicle. Disconnect HO2S 2 harness connector. Connect a test light between chassis ground and HO2S 2 ignition feed circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
  5. Connect test light between HO2S 2 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).
  6. Allow HO2S 2 to cool for at least 10 minutes. Using DVOM, check resistance between ignition feed and heater ground circuits at HO2S 2. If resistance is 3-10 ohms, go to step 9). If resistance is not as specified, go to step 14).
  7. Repair open HO2S 2 ignition feed circuit. After repairs, go to step 16).
  8. Repair open HO2S 2 heater ground circuit. After repairs, go to step 16).
  9. Check for faulty connection at HO2S 2. If faulty connection is found, repair as necessary and go to step 16). If connection is okay, go to next step.
  10. Turn ignition off. Disconnect PCM connectors. Check 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 and go to step 16). If resistance is 5 ohms or less, go to next step.
  11. Check for faulty connection at HO2S 2 harness connector. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to next step.
  12. Check for faulty ground circuit connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to next step.
  13. Check for faulty HO2S 2 signal circuit connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to next step.
  14. Replace HO2S 2. After replacing sensor, go to step 16).
  15. Locate and repair short to ground in HO2S 2 ignition feed circuit, replace fuse. After repairs, go to next step.
  16. Allow engine to cool completely. Using scan tool, clear DTCs. Turn ignition on, engine off. Read HO2S 2 voltage. If voltage is greater than 600 mV or less than 300 mV, repair is complete. If voltage is not as specified, return 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.