Conditions for Clearing the MIL/DTC

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

DTC P0141

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module (PCM) Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Start the engine. Allow the engine to idle at operating temperature. Refer to Scan Tool Data List . Observe the HO2S 2 parameter with a scan tool. Vary the engine speed from idle to 3,000 RPM several times within 5 seconds. Does the voltage fluctuate above and below the specified range?	390-520 mV	Go to Step 3	Go to Step 4
3	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	-	Go to Step 4	Go to Intermittent Conditions
4	Turn OFF the ignition. Disconnect the heated oxygen sensor (HO2S) 2 connector. Turn ON the ignition, with the engine OFF. Observe the HO2S 2 parameter with a scan tool. Is the voltage less then the specified value?	50 mV	Go to Step 9	Go to Step 5
5	IMPORTANT: Use a known good ground. DO NOT use the HO2S 2 heater low control circuit or the HO2S 2 low signal circuit. Probe the HO2S 2 heater ignition voltage circuit with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors .Does the test lamp illuminate?	-	Go to Step 7	Go to Step 6
6	Inspect the HO2S 2 heater ignition voltage fuse for an open. Is the fuse open?	-	Go to Step 10	Go to Step 16
7	Remove the test lamp from the previous step. Connect a 3-amp fused jumper wire between the HO2S 2 high signal circuit, on the engine harness side, and a good ground. Observe the HO2S 2 parameter with a scan tool. Is the voltage less than the specified value?	15 mV	Go to Step 8	Go to Step 12
8	Disconnect the powertrain control module (PCM) harness connector. Measure the resistance of the following circuits between the HO2S 2 harness connector and the PCM harness connector: HO2S 2 low signal circuit HO2S 2 heater low control circuit Is the resistance of either circuit more than the specified value?	5 Ω	Go to Step 17	Go to Step 13
9	Test the HO2S 2 high signal circuit for a short to the HO2S 2 heater low control circuit. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 15
10	Test the HO2S 2 heater ignition voltage circuit for a short to ground and replace the fuse. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 11
11	Test the HO2S 2 heater ignition voltage circuit on the sensor side of the HO2S connector for a short to ground. Refer to Circuit Testing . Is the sensor shorted to ground?	-	Go to Step 18	Go to Intermittent Conditions
12	Test the HO2S 2 high signal circuit for an open or high resistance condition. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 15
13	Inspect for the following that may affect the HO2S operation: NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. HO2S contamination NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices. Chafed, burnt, cut, pinched, or otherwise damaged HO2S wiring Exhaust system leaks or restrictions Evaporative Emissions (EVAP) system malfunction-Inspect the EVAP control system. Refer to Inspection/Maintenance (I/M) Evaporative Emission (EVAP) System Set Procedure . The fuel pressure-Incorrect fuel pressure can affect HO2S operation. Refer to Fuel System Diagnosis . Did you find and correct the condition?	-	Go to Step 20	Go to Step 14
14	Test for an intermittent and for a poor connection at the harness connector of the HO2S 2. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 18
15	Test for an intermittent and for a poor connection at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 19
16	Repair the open or high resistance condition in the HO2S 2 heater ignition voltage circuit. Refer to Wiring Repairs and Heated Oxygen Sensor (HO2S) Wiring Repairs . Did you complete the repair?	-	Go to Step 20	-
17	Repair the circuit that measures high resistance. Refer to Wiring Repairs and Heated Oxygen Sensor (HO2S) Wiring Repairs . Did you complete the repair?	-	Go to Step 20	-
18	Replace the HO2S 2. Refer to Heated Oxygen Sensor Replacement - Position 2 . Did you complete the replacement?	-	Go to Step 20	-
19	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 20	Go to Step 2
20	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 21
21	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK