P0133
DTC P0133 or P0153
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0133
- HO2S Slow Response Bank 1 Sensor 1
DTC P0153
- HO2S Slow Response Bank 2 Sensor 1
Diagnostic Fault Information
Circuit Description
The wide band heated oxygen sensor (HO2S) measures the amount of oxygen in the exhaust system and provides more information than the switching style HO2S. The wide band sensor consists of an oxygen sensing cell, an oxygen pumping cell, and a heater. The exhaust gas sample passes through a diffusion gap between the sensing cell and the pumping cell. The engine control module (ECM) supplies a voltage to the HO2S and uses this voltage as a reference to the amount of oxygen in the exhaust system. An electronic circuit within the ECM controls the pump current through the oxygen pumping cell in order to maintain a constant voltage in the oxygen sensing cell. The ECM monitors the voltage variation in the sensing cell and attempts to keep the voltage constant by increasing or decreasing the amount of current flow, or oxygen ion flow, to the pumping cell. By measuring the amount of current required to maintain the voltage in the sensing cell, the ECM can determine the concentration of oxygen in the exhaust. The HO2S voltage is displayed as a lambda value. A lambda value of 1 is equal to a stoichiometric air fuel ratio of 14.7:1. Under normal operating conditions, the lambda value will remain around 1. When the fuel system is lean, the oxygen level will be high and the lambda signal will be high or greater than 1. When the fuel system is rich, the oxygen level will be low, and the lambda signal will be low or less than 1. The ECM uses this information to maintain the correct air/fuel ratio.
Conditions for Running the DTCs
* DTC P0030, P0031, P0032, P0050, P0051, P0052, P0130, P0131, P0132, P0135, P0150, P0151, P0152, P0155, P0300-P0306, P0341, P0342, P0343, P0366, P0367, P0368, P0443, P0458, P0459, P0496, P0497, P064D, P064E, P2096, P2097, P2098, P2099, P2195, P2196, P2197, P2198, P2231, P2234, P2237, P2240, P2243, P2247, P2297, P2298, P2626, or P2629 are not set.
* The HO2S is at operating temperature.
* The HO2S is between 0.75-1.25 lambda.
* The engine speed is between 960-3,200 RPM.
* The engine load is between 17-68 percent and steady.
* The MAF is less than 8 grams.
* The engine is operating in closed loop.
* The long term fuel trim correction is active.
* The evaporative emission (EVAP) purge is not active, or the ECM determines the EVAP hydrocarbon (HC) concentration is less than a predetermined amount when EVAP purge is active.
* DTC P0133 and P0153 run continuously once the above conditions are met for greater than 10 minutes.
Conditions for Setting the DTCs
* The ECM has determined that the dynamic value of the affected HO2S 1 is less than a predetermined threshold.
* The above condition is met for greater than 4 seconds
Action Taken when the DTCs Set
DTCs P0133 and P0153 are Type B DTCs.
Conditions for Clearing the MIL/DTCs
DTCs P0133 and P0153 are Type B DTCs.
Diagnostic Aids
* The front wide band sensor does not toggle or switch like a switching HO2S. The front HO2S signal will be relatively stable for an idling engine.
* The following table illustrates the typical voltages for the HO2S circuits:
Reference Information
Schematic Reference
Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool DTC information. Verify no other DTCs are set.
• If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, open the hood to disable the Auto-Stop function.
2. Ignition ON, verify the scan tool hood position parameter displays Open.
• If the hood position does not display Open, refer to DTC P254F (P254F).
3. Verify that none of the following conditions exist:
* Inspect the HO2S for being secure.
* Lean or rich fuel injectors-Refer to Fuel Injector Solenoid Coil Test (Fuel Injector Solenoid Coil Test).
* Water intrusion in the HO2S harness connector
* HO2S wiring harness damage
* Incorrect RTV sealant
* Incorrect fuel system pressure-Refer to Fuel System Diagnosis (Fuel System Diagnosis).
* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool) (Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool) (Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)).
* Fuel saturation of the evaporative emission (EVAP) canister
* Exhaust leaks near the HO2S
* Engine vacuum leaks
* Engine oil consumption
* Engine coolant consumption
• If you find any of the above conditions, repair as necessary.
4. If all conditions test normal, replace the appropriate HO2S 1.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (Service and Repair)
* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (Service and Repair)
* Control Module References (Programming and Relearning) for engine control module replacement, setup, and programming