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 P0134 or P0154

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) 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	Start the engine. Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Cycle the throttle from idle to wide open throttle (WOT) 3 times within 5 seconds. Observe the affected heated oxygen sensor (HO2S) lambda value. Does the affected HO2S lambda value react immediately to 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 90 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. Inspect the exhaust system for any leaks upstream from the affected oxygen sensor. Inspect for any exhaust leaks between the HO2S 1 and the HO2S 2. Repair the exhaust leak as necessary. Refer to Exhaust Leakage in Engine Exhaust. Did you find and correct the condition?	-	Go to Step 20	Go to Step 5
5	Disconnect the connector for the HO2S that applies to this DTC. Visually and physically inspect for the following items: The HO2S 1 is securely installed. Terminal corrosion or water intrusion Terminal tension at the HO2S connectors Damaged wiring Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 6
6	Measure the voltage from the HO2S low reference circuit, on the engine harness side connector, to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems. Is the voltage within the specified range?	2.4-2.7 V	Go to Step 7	Go to Step 11
7	Measure the voltage from the HO2S reference voltage circuit, on the engine harness side connector, to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems. Is the voltage within the specified range?	2.8-3.1 V	Go to Step 8	Go to Step 12
8	Measure the voltage from the HO2S input pump current circuit, on the engine harness side connector, to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems. Is the voltage less than the specified value?	100 mV	Go to Step 9	Go to Step 13
9	Is the voltage within the specified range?	10-65 mV	Go to Step 10	Go to Step 14
10	Measure the voltage from the HO2S output pump current circuit, on the engine harness side connector, to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems. Is the voltage within the specified range?	10-65 mV	Go to Step 16	Go to Step 15
11	Test the HO2S low reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
12	Test the HO2S reference voltage circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
13	IMPORTANT: The normal open circuit voltage of the HO2S output pump current circuit is approximately 10-65 millivolts. The normal open circuit voltage of the HO2S low reference voltage circuit is 2.4-2.7 volts. Test the HO2S output pump current circuit for a short to the HO2S low reference circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
14	Test the HO2S input pump current circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
15	Test the HO2S output pump current circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
16	The HO2S may be detecting a lean or a rich exhaust condition. 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 . A leaking fuel pressure regulator - 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 20	Go to Step 18
17	Test for poor connections and shorted terminals at the harness connector of the engine control module (ECM). 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 20	Go to Step 19
18	Replace the affected HO2S. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 . Did you complete the replacement?	-	Go to Step 20	-
19	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 20	-
20	Clear the DTCs with a scan tool. Turn OFF the ignition for 90 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 in Vehicle DTC Information	System OK