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 P0135 or P0155

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	If DTCs P2251 or P2254 are also set, diagnose those DTCs first. Is DTC P2251, or P2254 also set?	-	Go to DTC P2251 or P2254	Go to Step 3
3	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 HO2S Bank 1 Sensor 1 or HO2S Bank 2 Sensor 1 parameter, with a scan tool. Does the lambda value reach the specified value when the engine decelerates?	1.989	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. Inspect the exhaust system for any leaks upstream from the affected heated oxygen sensor (HO2S). 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 11	Go to Step 6
6	Disconnect the connector for the HO2S 1 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 1 connectors Damaged wiring Repair as necessary. Refer to Heated Oxygen Sensor Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 11	Go to Step 7
7	Disconnect the engine control module (ECM). Measure the resistance of the following circuits with a DMM: The HO2S reference voltage circuit The HO2S low reference circuit The HO2S heater low control circuit The ignition 1 voltage circuit Refer to Circuit Testing in Wiring Systems.Is the resistance of any circuit more than the specified value?	5 ohm	Go to Step 9	Go to Step 8
8	Test for an intermittent and poor connections at the affected HO2S 1. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs , and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 11
9	Repair the circuits with high resistance. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 11	-
10	Replace the affected HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 . Did you complete the replacement?	-	Go to Step 11	-
11	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 12
12	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