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 P2A01

Step	Action	Value(s)	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	Is DTC P0138 or DTC P0140 also set?	-	Go to DTC P0138 or Go to DTC P0140	Go to Step 3
3	Start the engine. Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Operate the engine at 1,500 RPM for 30 seconds. While observing the HO2S 2 parameter with a scan tool, quickly cycle the throttle from closed throttle to wide open throttle, 3 times. Did the voltage vary above and below the specified range?	290-685 mV	Go to Step 4	Go to Step 5
4	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 5	Go to Intermittent Conditions
5	Turn OFF the ignition. Disconnect the heated oxygen sensor (HO2S) 2 connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the HO2S 2 low signal circuit, on the engine harness side, to a good ground with a DMM. Refer to Circuit Testing . Is the voltage more than the specified value?	5 V	Go to Step 9	Go to Step 6
6	Connect a 3-amp fused jumper wire between the HO2S 2 low signal circuit, on the engine harness side, and a good ground. Measure the voltage between the HO2S 2 high signal circuit, on the engine harness side, and a good ground with a DMM. Is the voltage more than the specified value?	410 mV	Go to Step 10	Go to Step 7
7	With the jumper wire from the previous step still connected, observe the HO2S 2 parameter with a scan tool. Is the voltage less than the specified value?	15 mV	Go to Step 11	Go to Step 8
8	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 13	Go to Step 12
9	Test the HO2S 2 low signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 17	Go to Step 14
10	Test the HO2S 2 low signal circuit for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 17	Go to Step 14
11	Test the HO2S 2 high signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 17	Go to Step 14
12	Test the HO2S 2 high signal circuit for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 17	Go to Step 14
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 . Did you find and correct the condition?	-	Go to Step 17	Go to Step 15
14	Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 17	Go to Step 16
15	Replace the HO2S 2. Refer to Heated Oxygen Sensor Replacement - Position 2 . Did you complete the replacement?	-	Go to Step 17	-
16	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 17	-
17	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 18
18	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