P1133
DTC P0133 or P1133
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provide an overview of each diagnostic category.
DTC Descriptor
DTC P0133 00
- HO2S Slow Response Sensor 1
DTC P1133 00
- HO2S Insufficient Switching Sensor 1
Diagnostic Fault Information
Circuit/System Description
The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an open loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, closed loop is entered. The engine control module (ECM) uses the HO2S voltage to determine the air to fuel ratio. An HO2S voltage that increases toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter closed loop earlier and the ECM to calculate the air to fuel ratio sooner.
Conditions for Running the DTC
* DTCs P0106 00, P0107 00, P0108 00, P0112 00, P0113 00, P0116 00, P0117 00, P0118 00, P0121 00, P0122 00, P0123 00, P0131 00, P0132 00, P0134 00, P0201 00, P0202 00, P0203 00, P0204 00, P0300 00, P0315 00, P0335 00, P0336 00, P044 00, P0443 00, P0446 00, P0449 00, P0451 00, P0452 00, P0453 00, and P0496 00 are not set.
* The calculated airflow into the engine is between 10-45 g/s.
* The engine speed is between 1 100-3 500 RPM.
* The engine coolant temperature is greater than 60°C (140°F).
* The Barometric Pressure (BARO) is greater than 70 kPa (10 PSI).
* The ignition voltage is between 10-18 V.
* The fuel system is in closed loop.
* The evaporative emissions (EVAP) purge is less than 20%.
* The EVAP purge is not changing states.
* The engine run time is greater than 3 min.
* The fuel level is greater than 10%.
* The long term fuel trim is enabled.
* The HO2S heater is enabled for greater than 40 s.
* The vehicle is not decelerating.
* The vehicle is not operating in power enrichment.
* The DTCs run once per ignition cycle when the above conditions are met for greater than 1 s.
Conditions for Setting the DTC
P0133 00
* The ECM detects that the HO2S 1 rich to lean or lean to rich average response time is greater than a calibrated value.
* DTC P0133 00 sets within 60 s when the above condition is met.
P1133 00
The ECM detects that the HO2S 1 rich to lean counts, or the lean to rich counts are less than a calibrated value.
Action Taken When the DTC Sets
DTCs P0133 00 and P1133 00 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0133 00 and P1133 00 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Verification
1. Observe the DTC information with a scan tool. Verify there are no other HO2S or fuel trim DTCs set.
• If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
2. Observe the DTC information with a scan tool. DTCs P0133 00 or P1133 00 should not set.
3. 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 data.
Circuit/System Testing
1. Verify none of the following conditions exist:
* Water intrusion in the HO2S harness connector
* Low or high fuel system pressure, refer to Fuel System Diagnosis (Fuel System Diagnosis).
* Fuel that is contaminated, refer to Alcohol/Contaminants-in-Fuel Diagnosis (Alcohol/Contaminants-in-Fuel Diagnosis).
* Fuel saturation of the evaporative emission (EVAP) canister
* Exhaust leaks near the HO2S
* Engine vacuum leaks
• If you find any of the above conditions, repair as necessary.
2. If all circuits test normal, replace the B52A Heated Oxygen Sensor 1.
Repair Instructions
Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (Heated Oxygen Sensor Resistance Learn Reset Caution).
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Heated Oxygen Sensor Replacement - Sensor 1 (1.6L LDE, LXV, and 1.8L 2H0) (Heated Oxygen Sensor Replacement - Sensor 1)
* Control Module References (Programming and Relearning)for ECM replacement, setup, and programming