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P2271




DTC P0133, P0134, P013A, P013B, P013E, P013F, P0140, P1133, P2270, P2271, or P2A00 (LAF) (2.4L)

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) provides an overview of each diagnostic category.

DTC Descriptors
DTC P0133
- HO2S Slow Response Sensor 1

DTC P0134
- HO2S Circuit Insufficient Activity 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 P0140
- HO2S Circuit Insufficient Activity 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 (CL) Performance Sensor 1

Diagnostic Fault Information





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 0-1,275 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.

Conditions for Running the DTC

P0133 and P1133
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0300, P0411, P0412, P0418, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496 are not set.
* The Engine Coolant Temperature (ECT) Sensor parameter is more than 70°C (158°F).
* The Ignition 1 Signal parameter is between 10-32 V.
* The Fuel Level Sensor parameter is more than 10 %.
* The Engine Run Time parameter is more than 120 s.
* The Engine Speed parameter is between 1,000-3,500 RPM.
* The EGR device control is not active.
* The idle speed device control is not active.
* The fuel device control is not active.
* The AIR device control is not active.
* The HO2S heaters have been ON for more than 40 s.
* The learned HO2S heater resistance is valid.
* The IAT parameter is more than -40°C (-40°F).
* The fuel composition is less than 87 % ethanol.
* The BARO parameter is more than 70 kPa.
* The fuel control is not in power enrichment.
* DFCO is not active.
* The Mass Airflow (MAF) Sensor parameter is between 14-40 g/s.
* The Loop Status parameter is Closed.
* DTCs P0133 and P1133 run once per drive cycle when the above conditions are met for 3 s.

P0134 and P0140
* DTCs P0068, P0101, P0102, P0103, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P1516, P2101, P2119, P2135, P2176 are not set.
* The Engine Coolant Temperature (ECT) Sensor parameter is more than 70°C (158°F).
* The Ignition 1 Signal parameter is between 10-32 V.
* The engine run time is more than 120 s.
* The fuel composition is less than 87 % ethanol.
* DTCs P0134 and P0140 run continuously when the above conditions are met.

P013A
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
* The system voltage is between 10-32 V.
* The fuel level is more than 10 %.
* Engine run time is equal to or more than 40 s.
* DTCs P013E and P2270 have run and passed.
THEN
* DFCO is active.
* The accelerator pedal position (APP) is stable.
* The torque converter clutch (TCC) is locked.
* This DTC runs once per trip.

P013B and P013F
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
* The system voltage is between 10-32 V.
* The fuel level is more than 10 %.
* Engine run time is equal to or more than 40 s.
* DTCs P013A, P013E, P013F, P2270, and P2271 have run and passed.
* DTCs P013B and P013F run once per trip.

P013E
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
* The system voltage is between 10-32 V.
* The fuel level is more than 10 %.
* Engine run time is equal to or more than 40 s.
* DTC P2270 has run and passed.
THEN
* DFCO is active.
* The APP is stable.
* The TCC is locked.
* This DTC runs once per trip.

P2270
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
* The system voltage is between 10-32 V.
* The fuel level is more than 10 %.
* Engine run time is equal to or more than 40 s.
* The engine speed is between 1,250-2,300 RPM.
* The airflow is equal to or more than 3 g/s and equal to or less than 12 g/s.
* The vehicle speed is equal to or more than 55 km/h (34.2 mph) and equal to or less than 120 km/h (74.6 mph).
* The short term fuel trim is equal to or more than 0.9, and equal to or less than 1.065.
* The fuel state is in Closed Loop.
* The evaporative emission (EVAP) diagnostics are not in control of purge.
* The Power Take-Off is not active.
* The exhaust gas recirculation (EGR) diagnostic is not intrusive.
* The HO2S heaters are ON for more than 120 s.
* The predicted catalytic converter temperature is between 650-900°C (1,202-1,652°F).
* This DTC runs once per trip when all of the above conditions have been met for 1 s.

P2271
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270 are not set.
* The system voltage is between 10-32 V.
* The fuel level is more than 10 %.
* Engine run time is equal to or more than 40 s.
* The learned HO2S heater resistance is valid.
* The engine speed is 1,250-2,300 RPM.
* The MAF parameter is 3-12 gps.
* The vehicle speed is 55-120 kph (34.2-74.6 mph).
* The short term fuel trim is 0.9-1.07.
* The fueling state is in Closed Loop.
* The EVAP is not in control of purge.
* The ethanol estimation is not active.
* Power take-off is not active.
* The EGR diagnostic is not intrusive.
* The HO2S heaters have been on more than 120 s.
* The predicted catalyst temperature is between 650-900°C (1,202-1,652°F).
* DTCs P013A, P013E, and P2270 have run and passed.
THEN
* DFCO is active.
* The APP is stable.
* The TCC is locked.
* This DTC runs once per trip when the above conditions are met for 3 s.

P2A00
* DTCs P0068, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P1516, P2101, P2119, P2135, P2176 are not set.
* The Engine Run Time parameter is more than 100 s.
* The Engine speed parameter is between 500-3,400 RPM.
* The Ignition 1 Signal parameter is between 10-32 V.
* The Mass Airflow (MAF) Sensor parameter is between 3.2-30 g/s.
* The ECT Sensor parameter is more than 70°C (158°F).
* DTC P2A00 runs continuously when the above conditions are met for 5 s.

Conditions for Setting the DTC

P0133
* The ECM detects that the HO2S 1 average response time is more than a calculated value.
* DTC P0133 sets within 60 s when the above condition is met.

P0134
* The ECM detects that the HO2S 1 parameter is between 400-500 mV for 100 milliseconds.
* The Throttle Position (TP) Indicated Angle parameter changes more than 1 %.
* DTC P0134 sets within 100 s when the above conditions are met.

P013A
* The ECM detects that the EWMA of the normalized integral value equals 8.4 integral units.
OR
* The ECM detects that the accumulated mass air flow monitored during rich-to-lean transitions between 450-150 mV is more than 28 grams.

P013B
* The ECM detects that the EWMA of the normalized integral value equals 8.2 integral units.
OR
* The ECM detects that the accumulated mass air flow monitored during lean-to-rich transitions between 300-600 mV is more than 130 grams.

P013E

The ECM detects that the O2 sensor cannot achieve voltage below 450 mV within 28 grams of accumulated air flow.

P013F

The ECM detects that the O2 sensor cannot achieve voltage above 300 mV within 130 grams of accumulated air flow.

P0140
* The ECM detects that the HO2S 2 parameter is between 400-500 mV.
* The TP Indicated Angle parameter changes more than 1 % 3 times.
* DTC P0140 sets within 100 s when the above conditions are met.

P1133
* The ECM detects that the 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 ECM detects that the O2 sensor cannot achieve voltage equal to or more than 775 mV.
AND
* The ECM detects that the accumulated mass air flow monitored during the Stuck Lean Voltage Test is more than 55 grams.

P2271
* The ECM detects that the O2 sensor cannot achieve voltage equal to or less than 100 mV.
AND
* The ECM detects that the accumulated mass air flow monitored during the Stuck Rich Voltage Test is more than 40 grams.

P2A00
* The ECM detects that the Loop Status parameter is open.
* DTC P2A00 sets within 50 s when the above condition is met.

Action Taken When the DTC Sets

* DTCs P0133, P0134, P013E, P013F, P0140, P1133, P2270, P2271, P2A00 are Type B DTCs.
* DTCs P013A and P013B are Type A DTCs.

Conditions for Clearing the MIL/DTC

* DTCs P0133, P0134, P013E, P013F, P0140, P1133, P2270, P2271, P2A00 are Type B DTCs.
* DTCs P013A and P013B are Type A 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)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify no B52 HO2S heater DTCs are set.

• If a B52 HO2S heater 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 B52 HO2S voltage parameter. The reading should be within the range of 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

P0133, P013A, P013B, P013E, P013F, or P1133
1. Verify none of the following conditions exist:

* Lean or rich fuel injectors-Refer to Fuel Injector Solenoid Coil Test (Fuel Injector Solenoid Coil Test).
* 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-Refer to Exhaust Leakage (Exhaust Leakage).
* Engine vacuum leaks
* 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 HO2S.

P0134, P0140, P2270, P2271, or P2A00
1. Ignition OFF, disconnect the appropriate B52 HO2S harness connector.
2. Ignition ON, observe the appropriate scan tool HO2S voltage parameter. The parameter should display 1.27 V.

• 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. Ignition ON, test for 2.5-3.0 V between the high signal circuit terminal B and ground.

• 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 terminal B and the low signal circuit terminal A.

Note: The low signal circuit is tied to a pull-up circuit within the ECM. A voltage of 0.90-1.10 V on the low signal circuit is normal.

5. Ignition ON, verify the scan tool HO2S parameter displays 0.0 V.

• 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, test or replace the appropriate B52 HO2S.

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 (Heated Oxygen Sensor Replacement - Sensor 1)
* Heated Oxygen Sensor Replacement - Sensor 2 (Heated Oxygen Sensor Replacement - Sensor 2)
* Control Module References (Programming and Relearning) for replacement, setup and programming

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