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DTC P0133, P013A, P013B, P013E, P013F, P1133, P2270, P2271, or P2A00

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC P0133: HO2S Slow Response Sensor 1

DTC P013A: HO2S Slow Response Rich to Lean Sensor 2

DTC P013B: HO2S Slow Response Lean to Rich Sensor 2

DTC P013E: HO2S Delayed Response Rich to Lean Sensor 2

DTC P013F: HO2S Delayed Response Lean to Rich Sensor 2

DTC P1133: HO2S Insufficient Switching Sensor 1

DTC P2270: HO2S Signal Stuck Lean Sensor 2

DTC P2271: HO2S Signal Stuck Rich Sensor 2

DTC P2A00: HO2S Circuit Closed Loop Performance Sensor 1

Diagnostic Fault Information

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

HO2S Heater Voltage Supply

P0030, P0036, P0102, P0132, P0135, P0138, P0141, P0443, P0458, P0598, *

P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141

P0030, P0036, P0102, P0132, P0134, P0135, P0138, P0140, P0141, P0443, P0458, P0598

P0690

P0135, P0141

HO2S Heater Control

P0030, P0036, P0053, P0054, P0135, P0141

P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141

P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141

P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141

P0135, P0141

HO2S High Signal

P0131, P0137

P0132, P0134, P0138, P0140

P0132, P0134, P0138, P0140

P0132, P0134, P0138, P0140

P0133, P013A, P013B, P013E, P013F, P1133, P2A00

HO2S Low Signal

P0131, P0137

P0132, P0134, P0138, P0140

P0132, P0134, P0138, P0140

P0132, P0134, P0138, P0140

P0133, P013A, P013B, P013E, P013F, P1133, P2A00

*Opens Fuse

Typical Scan Tool Data

HO2S 1 or 2

Circuit

Short to Ground

Open

Short to Voltage

Operating Conditions: Engine Running

Parameter Normal Range: 200-800 mV

HO2S 1 or 2 High Signal

0 mV

1,850-1,950 mV

1,850-1,950 mV

HO2S 1 or 2 Low Signal

0 mV

1,850-1,950 mV

1,850-1,950 mV

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 engine control module (ECM) 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 ECM, closed loop is entered. The 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.

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

    • DTCsP0101, 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 inlet air temperature (IAT) is greater 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.
    • A scan tool output device control is not active.
    • The fuel control system is not in decel fuel cut-off (DFCO)
    • The fuel control state is not in Power Enrichment.
    • The DTCs run 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, P16F3, P2101, or P2135 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
    • The fuel control system is in decel fuel cut-off (DFCO)
    • The DTCs run once per drive cycle when the above conditions are met.

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, P16F3, P2101, or P2135 are not set.
    • DTCsP013A, P013E, P013F, P2270, and P2271 have run and passed.
    • DTCs P013F has run and passed for P013B.
    • The ignition voltage is between 10-32 V.
    • The fuel level is more than 10 percent.
        Then
    • The fuel control system is in fuel enrichment mode.
    • The DTCs run once per drive cycle when the above conditions are met.

P2270 or P2271

    • DTCsP0101, 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).
    • The fuel control system is in decel fuel cut-off (DFCO)
    • 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).
    • DTCs P013A, P013E, and P2270 have run and passed. --P2271 only
    • DTC P2270 runs once per trip when all of the above conditions have been met for 3 s.
    • DTC P2271 runs once per trip.

P2A00

    • DTCsP0106, 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 is greater 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 temperature is warmer than 70°C (158°F).
    • The fuel control system is not in decel fuel cut-off (DFCO)
    • The fuel control system is in fuel enrichment mode.
    • DTC P2A00 runs continuously when the above conditions are met for 5 s.

Conditions for Setting the DTC

P0133

    • The ECM detects that the heated oxygen sensor (HO2S) 1 rich to lean or lean to rich average response time is greater than a calibrated threshold value.
    • DTC P0133 sets within 60 s when the above condition is met.

P013A

The accumulated mass air flow monitored during rich to lean transitions between 450-150 mV is greater than a calibrated value.

P013B

The accumulated mass air flow monitored during rich to lean transitions between 350-600 mV is greater than a calibrated value.

P013E

    • 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

    • 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

    • 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

    • 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

    • 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

    • The HO2S 1 is greater than 1,100 mV for greater than 5 s and the engine is not in closed loop.
    • DTC P2A00 sets within 25 s when the above condition is met.

Action Taken When the DTC Sets
    • DTCs P0133, P013E, P013F, P1133, P2270, P2271, P2A00 are Type B DTCs.
    • DTCs P013A and P013B are Type A DTCs.

Conditions for Clearing the DTC
    • DTCs P0133, P013E, P013F, P1133, P2270, P2271, P2A00 are Type B DTCs.
    • DTCs P013A and P013B are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Hybrid Modes of Operation Description

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Vehicle ON, observe the DTC information with a scan tool. Verify no other HO2S DTCs are set.
    2. ⇒If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  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. Verify none of the following conditions exist:
    2. • Lean or rich fuel injectors--Refer to Fuel Injector Solenoid Coil Test
    • Water intrusion in the B52 HO2S harness connector
    • Low or high fuel system pressure--Refer to Fuel System Diagnosis
    • Fuel that is contaminated--Refer to 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
    • Engine coolant consumption--Refer to Loss of Coolant
         ⇒If you find any of the above conditions, repair as necessary.
  2. Vehicle OFF, disconnect the harness connector at the appropriate B52 heated oxygen sensor.
  3. Vehicle in Service Mode, observe the scan tool HO2S 1 or 2 voltage parameter. The parameter should display between 1,850-1,950 mV.
    4. ⇒If less than the specified range, test the high and low signal circuits for a short to ground. If both signal circuits test normal, replace the K20 ECM.
  4. Test for 1,850-3,000 mV between the high signal circuit terminal listed below and ground.
    5. • 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.
  5. Vehicle OFF, connect a 3 A fused jumper wire between the high signal circuit and the low signal circuit terminals listed below.
    6. • B52 HO2S 1 high signal circuit terminal 4 to low signal circuit terminal 3
    • B52 HO2S 2 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.

  6. Vehicle in Service Mode, verify the scan tool HO2S 1 or 2 voltage parameter displays 0.0 mV.
    7. ⇒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.
  7. If all circuits test normal, test or replace the B52 HO2S.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Heated Oxygen Sensor Replacement - Sensor 1
    •  Heated Oxygen Sensor Replacement - Sensor 2
    • Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
    • Control Module References for ECM replacement, setup, and programming
   


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