Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

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: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check-Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Start the engine. Allow the engine to idle at operating temperature. Refer to Scan Tool Data List . Observe the HO2S 2 Heater parameter with a scan tool. Is the amperage within the specified range?	0.21-0.95 A	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	IMPORTANT: Use a known good ground. DO NOT use the heated oxygen sensor (HO2S) 2 heater low control circuit or the HO2S 2 low signal circuit. Turn OFF the ignition. Disconnect the HO2S 2. Turn ON the ignition, with the engine OFF. Probe the HO2S 2 heater ignition 1 voltage circuit, on the engine harness side, with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems. Does the test lamp illuminate?	-	Go to Step 6	Go to Step 5
5	Test the HO2S 2 heater ignition 1 voltage fuse for an open. Refer to Circuit Testing in Wiring Systems. Is the fuse open?	-	Go to Step 11	Go to Step 15
6	Turn OFF the ignition. Connect a test lamp between the HO2S 2 heater ignition 1 voltage circuit and the HO2S 2 heater low control circuit on the engine harness side. Start the engine. Does the test lamp illuminate?	-	Go to Step 7	Go to Step 10
7	Leave the test lamp connected between the HO2S 2 heater ignition 1 circuit and the HO2S 2 heater low control circuit. Turn OFF the ignition. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate?	-	Go to Step 9	Go to Step 8
8	Turn OFF the ignition. Measure the resistance of the following circuits with a DMM: HO2S 2 heater ignition 1 circuit HO2S 2 heater low control circuit Refer to Circuit Testing in Wiring Systems. Is the resistance of either circuit more than the specified value?	5 Ω	Go to Step 16	Go to Step 13
9	Test the HO2S 2 heater low control circuit for a short to ground. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 19	Go to Step 14
10	Test the HO2S 2 heater low control circuit for an open or high resistance condition. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 19	Go to Step 14
11	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 in Wiring Systems. Did you find and correct the condition?	-	Go to Step 19	Go to Step 12
12	IMPORTANT: Perform the following test on all HO2S' that are supplied voltage by the suspect circuit. Test the ignition 1 voltage circuit on the sensor side of the HO2S connector for a short to ground. Refer to Circuit Testing in Wiring Systems.Is any sensor shorted to ground?	-	Go to Step 17	Go to Intermittent Conditions
13	Test for an intermittent and for a poor connection at the HO2S 2. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 19	Go to Step 17
14	Test for shorted terminals and poor connections at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 19	Go to Step 18
15	Repair the open or high resistance condition in the HO2S 2 heater ignition voltage circuit. Refer to Circuit Testing , Wiring Repairs and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 19	-
16	Repair the circuit that measured high resistance. Refer to Circuit Testing , Wiring Repairs and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 19	-
17	Replace the HO2S 2. Refer to Heated Oxygen Sensor Replacement - Position 2 . Did you complete the replacement?	-	Go to Step 19	-
18	Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement . Did you complete the replacement?	-	Go to Step 19	Go to Step 2
19	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 20
20	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK