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DTC P0141: 1/2 O2 Sensor Heater Failure

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: The 1/2 O2 sensor is referred to as downstream oxygen sensor in this test. Downstream oxygen sensor heater operation is monitored with engine at idle immediately after a cold start with engine temperature less than 147°F (63.8°C) and battery temperature is within 27°F (-2.7°C) of engine temperature. DTC may be stored in Powertrain Control Module (PCM) if downstream oxygen sensor voltage is more than 3 volts for 30-90 seconds. Possible causes are: defective downstream oxygen sensor or heater, defective Auto Shutdown (ASD) relay circuit, or defective connectors or wiring.
  1. Using scan tool, check for DTCs. If global good trip counter is displayed and equal to zero, go to next step. If global good trip counter is not displayed and equal to zero, go to step  3.
  2. Turn ignition on with engine off. With scan tool in SENSORS mode, wait about 3 minutes until downstream oxygen sensor voltage is 4.5 volts. Once downstream oxygen sensor voltage is 4.5 volts, use scan tool in ACTUATOR mode to actuate oxygen sensor heater test while monitoring downstream oxygen sensor voltage for at least 3 minutes. Oxygen sensor heater test may also be referred to as O2 sensor heater test. If downstream oxygen sensor voltage is one volt or less, go to next step. If downstream oxygen sensor voltage is more than one volt, go to step  4.
  3. At this time, conditions for downstream oxygen sensor heater failure does not exist or is an intermittent problem. Using scan tool, read FREEZE FRAME data while attempting to duplicate the condition that caused DTC to be set by paying special attention to the conditions that downstream oxygen sensor heater is monitored. Downstream oxygen sensor heater is monitored with engine at idle immediately after a cold start with engine temperature less than 147°F (63.8°C) and battery temperature is within 27°F (-2.7°C) of engine temperature. Recheck for DTC P0141: 1/2 O2 SENSOR HEATER FAILURE. If DTC P0141: 1/2 O2 SENSOR HEATER FAILURE exists, go to next step. If DTC P0141: 1/2 O2 SENSOR HEATER FAILURE does not exist, downstream oxygen sensor heater failure no longer exists. Perform TEST VER-5A3 .
  4. Disconnect connector at downstream oxygen sensor. Downstream oxygen sensor is located on exhaust pipe, behind catalytic converter. Inspect connector for corroded, pushed out, miswired or damaged terminals. If terminals are not corroded, pushed out, miswired or damaged, go to next step. If terminals are corroded, pushed out, miswired or damaged, repair connector as necessary. Perform TEST VER-5A3 .
  5. Turn ignition on with engine off. Ensure connector is still disconnected at downstream oxygen sensor. Using scan tool in ACTUATOR mode, actuate oxygen sensor heater test.
  6. Using voltmeter, check voltage at terminal No. 4 (Orange/Dark Green wire) on wiring harness side of connector for downstream oxygen sensor while still performing oxygen sensor heater test. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit on Orange/Dark Green wire from Auto Shutdown (ASD) relay to downstream oxygen sensor. ASD relay is located in power distribution center at driver's side front corner of engine compartment, near air cleaner assembly. If necessary to check fuse No. 1 in the circuit from ASD relay to downstream oxygen sensor, fuse No. 1 is located in the power distribution center. Perform TEST VER-5A3 .
  7. Stop oxygen sensor heater test. Using ohmmeter, check resistance of downstream oxygen sensor heater. Oxygen sensor heater resistance can be checked between the 2 terminals on oxygen sensor side of connector for downstream oxygen sensor that correspond with the Orange/Dark Green wire and Black wire on wiring harness side of connector for downstream oxygen sensor. If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace downstream oxygen sensor. Perform TEST VER-5A3 .
  8. Using ohmmeter, check resistance between ground and terminal No. 6 (Black wire) on wiring harness side of connector for downstream oxygen sensor. If resistance is less than 5 ohms, replace downstream oxygen sensor. Perform TEST VER-5A3 . If resistance is 5 ohms or more, repair open ground circuit on Black wire to downstream oxygen sensor. Perform TEST VER-5A3 .
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