P013A
DTC P0133, P013A, P013B, P013E, P013F, P1133, P2270, P2271, or P2A00
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 Descriptors
DTC P0133
- HO2S Slow Response Sensor 1
DTC P013A 00
- HO2S Slow Response Rich to Lean Sensor 2
DTC P013B 00
- HO2S Slow Response Lean to Rich Sensor 2
DTC P013E 00
- HO2S Delayed Response Rich to Lean Sensor 2
DTC P013F 00
- HO2S Delayed Response Lean to Rich Sensor 2
DTC P1133 00
- HO2S Insufficient Switching Sensor 1
DTC P2270 00
- HO2S Signal Stuck Lean Sensor 2
DTC P2271 00
- HO2S Signal Stuck Rich Sensor 2
DTC P2A00 00
- HO2S Circuit Closed Loop Performance Sensor 1
Typical Scan Tool Data
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 0-1,900 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, closed loop is entered. The control module 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 control module to calculate the air to fuel ratio sooner.
This ECM uses a high bias voltage on the high and low signal circuits of the HO2S. The voltage measured between the low signal terminal and ground varies based on the temperature of the sensor and will typically be between 0-1,000 mV under normal operating conditions. The value of the high signal terminal measured to ground is equal to the value of the low signal measured to ground plus the 1,900 mV bias between the low signal and the high signal. In closed loop, the sensor functions in the same voltage range as systems with the low bias voltage. In open loop or open circuit conditions, the high bias voltage is present and takes the voltage outside of the normal operating range for easier fault detection.
Conditions for Running the DTC
P0133 or P1133
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0442, P0443, P0449, P0452, P0453, P0455, P16F3, P2101, P2135 are not set.
* The engine coolant temperature (ECT) is greater than 50°C (122°F).
* The ignition voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* The engine run time is greater than 90 s.
* The intake air temperature (IAT) is warmer than -40°C (-40°F).
* The HO2S heater is on for greater than 40 s.
* The fuel alcohol content is less than 87 percent ethanol.
* The engine speed is between 1,000-3,500 RPM.
* Barometric (BARO) pressure is greater than 70 kPa (10 psi).
* The mass air flow (MAF) is between 17-40 g/s.
* The fuel system is in Closed Loop.
* Device Controls are not active.
* DFCO is not active.
* The Fuel Control State is not in Power Enrichment.
* DTC P0131 00 runs once per drive cycle when the above conditions are met for greater than 1 s.
P013A or P013E
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0411, P16F3, P2101, P2135, P2440, P2444 are not set.
* The Ignition voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* DTC P2270 has run and passed.
* DTC P013E has run and passed for P013A.
Then
* Deceleration fuel cut-off is active.
* DTC P013A runs once per trip.
P013B or P013F
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0411, P16F3, P2101, P2135, P2440, P2444 are not set.
* The Ignition voltage is between 10-32 V.
* The fuel level is more than 10 percent.
* DTCs P013A, P013E, P013F, P2270, and P2271 have run and passed.
* DTCs P013F has run and passed for P013B.
Then
* Fuel Enrichment Mode is continued.
* DTC P013B 00 runs once per trip.
P2270 00
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P16F3, P2101, P2135 are not set.
* The Ignition voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* The engine speed is between 1,800-3,500 RPM.
* The airflow is between 18-28 g/s.
* The vehicle speed is between 40-145 km/h (25-90 MPH).
* Deceleration fuel cut-off (DFCO) is active.
* The engine is operating in Closed Loop.
* The evaporative emission (EVAP) diagnostics are not in control of purge.
* The HO2S heater is on for greater than 60 s.
* The catalyst temperature is between 0-1,000°C (32-1,832°F).
* DTC P2270 00 runs once per trip when all of the above conditions have been met for 3 s.
P2271
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P16F3, P2101, P2135 are not set.
* The system voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* The engine speed is between 1,800-3,500 RPM.
* The airflow is between 18-28 g/s.
* The vehicle speed is between 40-145 km/h (25-90 MPH).
* The engine is operating in Closed Loop.
* The evaporative emission (EVAP) diagnostics are not in control of purge.
* The HO2S heater is on for greater than 60 s.
* The catalyst temperature is between 0-1,000°C (32-1,832°F).
* Deceleration fuel cut-off (DFCO) is active.
* DTCs P013A, P013E, and P2270 have run and passed.
* DTC P2271 runs once per trip.
P2A00
* DTCs P0106, P0107, P0108, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0131, P0132, P0201, P0202, P0203, P0204, P0222, P0223, P16F3, P2101, P2135 are not set.
* The ignition voltage is between 10-32 V.
* The engine run time parameter is more than 100 s.
* The engine speed is between 1,000-3,400 RPM.
* The ignition voltage is between 10-32 V.
* The engine air flow is between 4-30 g/s.
* The engine coolant is hotter than 70°C (158°F).
* Deceleration fuel cut-off (DFCO) is not active.
* Fuel Enrichment is not active.
* Engine run time is greater than 100 s.
* DTC P2A00 00 runs continuously when the above conditions are met for 5 s.
Conditions for Setting the DTC
P0133 00
* The ECM detects that the heated oxygen sensor (HO2S) 1 rich to lean or lean to rich average response time is more than a calibrated threshold value.
* DTC P0133 00 sets within 60 s when the above condition is met.
P013A 00
The accumulated mass air flow monitored during rich to lean transitions between 450-150 mV is greater than a calibrated value.
P013B 00
The accumulated mass air flow monitored during rich to lean transitions between 350-600 mV is greater than a calibrated value.
P013E 00
* The ECM detects that the heated oxygen sensor (HO2S) 2 cannot achieve voltage below 450 mV.
and
* The accumulated mass air flow monitored during the Delayed Response Test under DFCO is greater than a calibrated value.
P013F 00
* The ECM detects that the heated oxygen sensor (HO2S) 2 cannot achieve voltage above 350 mV.
and
* The accumulated mass air flow monitored during the Delayed Response Test is greater than a calibrated value.
P1133 00
* The ECM detects that the heated oxygen sensor (HO2S) 1 rich to lean counts, or the lean to rich counts are less than a calibrated value.
* DTC P1133 sets within 60 s when the above condition is met.
P2270 00
* The heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage greater than 850 mV.
and
* The accumulated mass air flow monitored during the Stuck Lean Voltage Test is greater than a calibrated value.
P2271 00
* The ECM detects that the heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage less than 100 mV.
and
* The accumulated mass air flow monitored during the stuck rich voltage test is greater than a calibrated value.
P2A00 00
* The HO2S 1 is greater than 1,100 mV for greater than 5 s and the engine is not in closed loop.
* DTC P2A00 00 sets within 25 s when the above condition is met.
Action Taken When the DTC Sets
* DTCs P0133 00, P013E 00, P013F 00, P1133 00, P2270 00, P2271 00, P2A00 00 are Type B DTCs.
* DTCs P013A 00 and P013B 00 are Type A DTCs.
Conditions for Clearing the DTC
* DTCs P0133 00, P013E 00, P013F 00, P1133 00, P2270 00, P2271 00, P2A00 00 are Type B DTCs.
* DTCs P013A 00 and P013B 00 are Type A DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation
Hybrid Modes of Operation Description Hybrid Modes of Operation Description
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 Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. Verify no HO2S DTCs are set.
• If a HO2S DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Engine running, observe the appropriate scan tool HO2S 1 or 2 voltage parameter. The reading should vary between 50-1,050 mV.
3. 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
DTC P0133, P013A, P013B, P013E, P013F, or P1133
1. Verify none of the following conditions exist:
* Lean or rich fuel injectors.
* Water intrusion in the B52 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
* Engine vacuum leaks
* Engine oil consumption-Refer to Oil Consumption Diagnosis Component Tests and General Diagnostics
* Engine coolant consumption-Refer to Loss of Coolant Loss of Coolant
• If you find any of the above conditions, repair as necessary.
2. If all conditions test normal, test or replace the appropriate B52 HO2S.
DTC P2270, P2271, or P2A00
1. Ignition OFF, disconnect the harness connector at the appropriate B52 heated oxygen sensor.
2. Service Mode active, observe the scan tool HO2S 1 or 2 voltage parameter. The parameter should display between 1,850-1,950 mV.
• If less than the specified range, test the high and low signal circuits for a short to ground. If both signal circuit test normal, replace the K20 ECM.
3. Test for 1,850-3,000 mV between the high signal circuit terminal listed below and ground.
* B52 HO2S 1 high signal terminal 4
* B52 HO2S 2 high signal terminal B
• If less than the specified range, test the high signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
• If greater than the specified range, test the high signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
4. Ignition OFF, connect a 3 A fused jumper wire between the high signal circuit and the low signal circuit terminals listed below.
• B52 HO2S 1 high signal circuit terminal 4 to low signal circuit terminal 3
• B52 HO2S high signal circuit terminal B to low signal circuit terminal A
Note: The low signal circuit is tied to a pull-up circuit within the ECM. A voltage of 0-1,100 mV on the low signal circuit is normal.
5. Service Mode active, verify the scan tool HO2S 1 or 2 voltage parameter displays 0.0 mV.
• If greater than the specified range, test the low signal circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
6. If all circuits test normal, replace the appropriate B52 HO2S.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Heated Oxygen Sensor Replacement - Sensor 1 Heated Oxygen Sensor Replacement - Sensor 1
* Heated Oxygen Sensor Replacement - Sensor 2 Heated Oxygen Sensor Replacement - Sensor 2
* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset After replacing a HO2S.
* Control Module References Control Module References for ECM replacement, setup, and programming