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DTC P0141: O2 Sensor 1/2 Heater Failure

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Monitored with engine idling immediately after a cold start (engine temperature less than 147°F (64°C) and battery temperature plus or minus 27°F (3°C) of engine temperature. Set condition is when O2S 1/2 voltage is more than 3 volts for 30-90 seconds. Possible causes are: O2S 1/2 connector damaged, O2S 1/2 ground circuit open, ASD relay output circuit open, O2S 1/2 failure or O2S 1/2 heater failure.
  1. Using scan tool, read DTCs. If scan tool display GLOBAL GOOD TRIP counter is equal to zero, go to next step. If scan tool GLOBAL GOOD TRIP counter is not equal to zero, go to step  3 .
  2. Turn ignition on with engine off. Using scan tool in SENSOR MODE, wait (approximately 3 minutes) for O2S 1/2 voltage to reach 4.5 volts. Using scan tool, perform O2S heater test. Monitor this test for 3 minutes. If voltage is one volt or less, go to next step. If voltage is more than one volt, go to step  4 .
  3. At this time problem does not exist or is an intermittent failure. Using scan tool, read FREEZE FRAME data. Attempt to operate vehicle in similar conditions. Pay particular attention to code set conditions: engine RPM, coolant temperature, engine load and manifold vacuum. If DTC reoccurs, go to next step. If DTC does not reoccur, test is complete. Perform TEST VER-5A: ROAD TEST FOR OBD II VERIFICATION  .
  4. Disconnect O2S 1/2 connector. O2S 1/2 is located downstream of catalytic converter. Inspect electrical connectors and clean/repair as necessary. Inspect O2S 1/2 connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to next step. If connector is not okay, repair or replace connector as necessary. Perform TEST VER-5A: ROAD TEST FOR OBD II VERIFICATION  .
  5. Turn ignition on with engine off. Using scan tool, perform O2S heater test. Using a DVOM, check voltage of O2S 1/2 connector (harness side) ASD relay output circuit (Orange/Dark Green wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit. Perform TEST VER-5A: ROAD TEST FOR OBD II VERIFICATION  .
  6. Using a DVOM, check resistance between O2S 1/2 connector (component side) terminals No. 1 and 2 (heater circuit). If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace O2S 1/2. Perform TEST VER-5A: ROAD TEST FOR OBD II VERIFICATION  .
  7. Turn ignition off. Using a DVOM, check resistance of heater ground circuit between O2S 1/2 connector (harness side) (Black wire) and chassis ground. If resistance is less than 5 ohms, replace O2S 1/2. Perform TEST VER-5A: ROAD TEST FOR OBD II VERIFICATION  . If resistance is 5 ohms or more, repair open O2S 1/2 heater ground circuit. Perform TEST VER-5A: ROAD TEST FOR OBD II VERIFICATION  .
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