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DTC P0141: Heated Oxygen Sensor (Ho2S) No. 2 Heater Circuit Malfunction

  1. Disconnect HO2S No. 2 harness connector. Using DVOM, measure resistance between terminals No. 3 and 4 of HO2S No. 2. See Figure . If resistance is 11.7-14.3 ohms, go to next step. If resistance is not as specified, replace HO2S No. 2 and retest system.
  2. Reconnect HO2S No. 2 harness connector. Turn ignition on. Measure voltage (backprobe) between ground and PCM harness connector terminal E61-3. See PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article for PCM terminal identification. If voltage is 10-14 volts, go to next step. If voltage is not as specified, check for open or short circuits between terminals No. 3 (Pink/Green wire) or 4 (Black/White wire) of HO2S No. 2 and PCM. Repair as necessary. If circuits are okay, replace PCM and retest system.
  3. Drive vehicle at 30-40 mph for 2 minutes or more. Bring engine to idle and measure voltage (backprobe) between ground and PCM harness connector terminal E61-3 (Pink/Green wire). If voltage is 0-1 volt, check for an intermittent problem. See TROUBLE SHOOTING - NO CODES article. If voltage is not as specified, check for poor PCM harness connection at E61-3. Repair as necessary. If connection is okay, replace PCM and retest system.
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