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DTC P0141: 1/2 O2 Sensor Heater Failure: Testing

NOTE: 1/2 HO2S may also be referred to as an downstream oxygen sensor. 1/2 HO2S is mounted on catalytic converter.
  1. Turn ignition on. Using scan tool, read DTCs. If Good Trip counter is displayed for DTC P0141 and displayed count is "0", go to next step. If Good Trip counter is not displayed for DTC P0141 or displayed count is not "0", go to step  3.
  2. Turn ignition off. Allow HO2S to cool down for about 8 minutes. Turn ignition on. Using scan tool in SENSOR mode, monitor 1/2 HO2S voltage until voltage stabilizes at .4-.6 volt. Using scan tool, actuate HO2S HEATER TEST and monitor 1/2 HO2S voltage for 2 minutes. If voltage stays at .4-.6 volt, go to next step. If voltage does not stay at .4-.6 volt, go to step  7.
  3. Turn ignition off. Allow HO2S to cool down to room temperature. Disconnect 1/2 HO2S connector. Measure resistance between Brown/White and Black/Dark Blue wires at 1/2 HO2S connector (component side). If resistance is not 4-7 ohms, replace 1/2 HO2S. If resistance is 4-7 ohms, 1/2 HO2S heater element is okay. Go to next step.
  4. Ensure ignition is off. Measure resistance between ground and Black wire at 1/2 HO2S harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire.
  5. Ensure 1/2 HO2S is disconnected. Turn ignition on. Using scan tool, actuate HO2S HEATER TEST. Measure voltage between ground and Brown/White wire at 1/2 HO2S wiring harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open in power circuit (Brown/White wire) to 1/2 HO2S heater. See WIRING DIAGRAMS article.
  6. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  7. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.
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