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 P1133

Step	Action	Values	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	Start the engine. Allow the engine to idle at operating temperature. Refer to Scan Tool Data List . Clear the DTC and record the Freeze/Frame Failure Records. Observe the heated oxygen sensor (HO2S) 1 voltage parameter with a scan tool. Does the HO2S 1 voltage fluctuate rapidly above and below the specified range?	350-550 mV	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 HO2S 1 connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the high signal circuit of the HO2S 1 harness connector on the engine harness side to a good ground with a DMM. Is the HO2S 1 voltage parameter within the specified range?	425-500 mV	Go to Step 5	Go to Step 6
5	Turn OFF the ignition. Connect a 3-amp fused jumper wire between the HO2S 1 high signal circuit and the HO2S 1 low reference circuit, on the engine harness side. Turn ON the ignition, with the engine OFF. Observe the HO2S 1 voltage parameter with a scan tool. Is the HO2S 1 voltage less than the specified value?	25 mV	Go to Step 7	Go to Step 6
6	Turn OFF the ignition. Disconnect both powertrain control module (PCM) connectors. Measure the resistance of each of the following circuits with a DMM: HO2S 1 high signal circuit between HO2S connector and the PCM connector HO2S 1 low reference circuit between HO2S connector and the PCM connector Low reference loop between pin C1-29 and pin C2- 80 of the PCM connectors - Refer to Circuit Testing . Is the resistance of each circuit less than the specified value?	5 Ω	Go to Step 10	Go to Step 11
7	Remove the jumper wire from the previous step. Connect a test lamp between the HO2S 1 heater ignition voltage circuit and the HO2S 1 heater low control circuit, on the engine harness side. Start the engine. Does the test lamp illuminate?	-	Go to Step 8	Go to Step 4 in DTC P0135
8	Inspect for the following that may affect the HO2S operation: NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. HO2S for contamination NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices. Chafed, burnt, cut, pinched, or otherwise damaged HO2S wiring The HO2S must have a clean air reference in order to function properly. This clean air reference is obtained by way of the HO2S wires. Obstruction of the air reference and degraded HO2S performance could result from any attempt to repair the above conditions. Exhaust system leaks or restrictions Evaporative Emissions (EVAP) system malfunction-Inspect the EVAP control system. Refer to Inspection/Maintenance (I/M) Evaporative Emission (EVAP) System Set Procedure . The fuel pressure-Incorrect fuel pressure can affect HO2S operation. Refer to Fuel System Diagnosis . Did you find and correct the condition?	-	Go to Step 14	Go to Step 9
9	Test for an intermittent and for a poor connection at the harness connector of the HO2S 1. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 14	Go to Step 12
10	Test for an intermittent and for a poor connection at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 14	Go to Step 13
11	Repair the circuit that measured a high resistance or an open. Refer to Wiring Repairs . Did you complete the repair?	-	Go to Step 14	-
12	Replace the HO2S 1 sensor. Refer to Heated Oxygen Sensor Replacement - Position 1 . Did you complete the replacement?	-	Go to Step 14	-
13	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 14	-
14	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 15
15	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