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 P0140

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 - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Start the engine. Wait 15 seconds to allow the HO2S 2 heater current to stabilize. Observe the Heated Oxygen Sensor (HO2S) 2 Heater parameter with a scan tool. Is the HO2S 2 Heater parameter within the specified range?	0.199-1.5 A	Go to Step 3	Go to DTC P0141
3	Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Operate the engine at 2,000 RPM for 30 seconds. Quickly cycle the throttle from closed throttle to wide open throttle (WOT) 3 times, while observing the HO2S 2 parameter with a scan tool. Did the HO2S 2 change more than the specified value?	200 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 Testing for Intermittent Conditions and Poor Connections
5	Turn OFF the ignition. Disconnect the HO2S 2. Turn ON the ignition, with the engine OFF. Observe the HO2S 2 parameter with a scan tool. Is the HO2S 2 parameter more than the specified value?	800 mV	Go to Step 6	Go to Step 7
6	IMPORTANT: The normal voltage on the high signal circuit is between 400-500 mV. The sensor may be damaged if the circuit is shorted to a voltage source. Test the HO2S 2 high signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .Did you find and correct the condition?	-	Go to Step 18	Go to Step 17
7	Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S 2 harness connector on the engine harness side and the low signal circuit of the HO2S 2 harness connector on the engine harness side. Observe the HO2S 2 parameter with a scan tool. Is the HO2S 2 parameter within the specified range?	400-500 mV	Go to Step 9	Go to Step 8
8	Remove the jumper wire from the previous step. Test the HO2S 2 heater low control circuit for a short to one of the following circuits: The HO2S 2 low signal circuit The HO2S 2 high signal circuit Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 14
9	Remove the jumper wire from the previous step. Connect a 3-amp fused jumper wire from the high signal circuit of the HO2S 2 harness connector on the engine harness side and ground. Observe the HO2S 2 parameter with a scan tool. Is the HO2S 2 parameter within the specified range?	400-500 mV	Go to Step 11	Go to Step 10
10	Remove the jumper wire from the previous step. Test the HO2S 2 low signal circuit for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 15
11	Remove the jumper from the previous step. Measure the voltage from the high signal circuit of the HO2S 2 harness connector on the engine harness side to a good ground with a DMM. Refer to Circuit Testing . Is the voltage more than the specified value?	1 V	Go to Step 12	Go to Step 13
12	IMPORTANT: The normal voltage on the low signal circuit is between 20-100 mV. 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 18	Go to Step 17
13	Test the HO2S 2 high signal circuit for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 15
14	Test for an intermittent and for a poor connection at the HO2S 2. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 18	Go to Step 16
15	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 18	Go to Step 17
16	NOTE: Refer to Heated Oxygen Sensor (HO2S) Resistance Learn Reset Notice . Replace the HO2S 2. Refer to Heated Oxygen Sensor Replacement - Position 2 .Did you complete the replacement?	-	Go to Step 18	-
17	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 18	-
18	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 19
19	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