Conditions for Clearing the MIL/DTC

WARNING: This page is about a different variant/trim than selected.

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 or P0160

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Allow the engine to reach normal operating temperature. Refer to Scan Tool Data List . Quickly cycle the throttle from closed throttle to wide open throttle (WOT) 3 times within 5 seconds, while observing the HO2S Bank 1 Sensor 2 or HO2S Bank 2 voltage parameter with a scan tool. Does the voltage react immediately when performing the above action?	-	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 affected heated oxygen sensor (HO2S) 2. Connect a 3-amp fused jumper wire between the HO2S high signal circuit, on the engine harness side connector, and a good ground. Turn ON the ignition, with the engine OFF. Observe the affected HO2S 2 parameter with a scan tool. Is the voltage less than the specified value?	25 mV	Go to Step 5	Go to Step 7
5	Remove the jumper wire from the previous step. Connect a 3-amp fused jumper wire between the HO2S high signal circuit and the HO2S low signal circuit, on the engine harness side connector. Observe the affected HO2S 2 parameter with a scan tool. Is the voltage less than the specified value?	25 mV	Go to Step 6	Go to Step 8
6	Remove the jumper wire from the previous step. Measure the resistance of the following circuits with a DMM: The HO2S heater low control circuit The ignition 1 voltage circuit Refer to Circuit Testing in Wiring Systems. Is the resistance of either circuit more than the specified value?	5 ohm	Go to Step 12	Go to Step 9
7	Test the HO2S high signal circuit for an open or high resistance. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 11
8	Test the HO2S low signal circuit for an open or high resistance. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 11
9	The HO2S is detecting a rich or lean exhaust condition or may be contaminated. Inspect for one of the following conditions: HO2S connector water intrusion A silicon-contaminated HO2S Fuel-contaminated engine oil Incorrect fuel pressure-Refer to Fuel System Diagnosis . Rich fuel injectors Lean fuel injectors-Refer to Fuel System Diagnosis . An exhaust leak between the HO2S and the engine-Refer to Exhaust Leakage in Engine Exhaust. Vacuum leaks Fuel contamination-Water, even in small amounts, can be delivered to the fuel injectors. The water can cause a lean exhaust to be indicated. Excessive alcohol in the fuel can also cause this condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis (W/Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (W/O Special Tool) for the proper procedure for inspecting for contaminants. An inaccurate mass air flow (MAF) sensor Repair any of the above or similar engine conditions, as necessary. Did you find and correct the condition?	-	Go to Step 15	Go to Step 10
10	Test for intermittent and poor connections at the HO2S. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs , and Heated Oxygen Sensor Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 13
11	Test for intermittent and poor connections at the engine control module (ECM). 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 15	Go to Step 14
12	Repair the circuit with high resistance. Refer to Wiring Repairs and Heated Oxygen Sensor Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 15	-
13	Replace the affected HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 . Did you complete the replacement?	-	Go to Step 15	-
14	Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 15	-
15	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 16
16	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 in Vehicle DTC Information	System OK