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P0157




DTC P0131, P0132, P0137, P0138, P0151, P0152, P0157, or P0158

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 P0131
- HO2S Circuit Low Voltage Bank 1 Sensor 1

DTC P0132
- HO2S Circuit High Voltage Bank 1 Sensor 1

DTC P0137
- HO2S Circuit Low Voltage Bank 1 Sensor 2

DTC P0138
- HO2S Circuit High Voltage Bank 1 Sensor 2

DTC P0151
- HO2S Circuit Low Voltage Bank 2 Sensor 1

DTC P0152
- HO2S Circuit High Voltage Bank 2 Sensor 1

DTC P0157
- HO2S Circuit Low Voltage Bank 2 Sensor 2

DTC P0158
- HO2S Circuit High Voltage Bank 2 Sensor 2

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The control module supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the control module operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below the bias voltage. A high HO2S voltage indicates a rich exhaust stream. A low HO2S voltage indicates a lean exhaust stream.

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

P0131, P0137, P0151, or P0157

* DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135 or P2176 is not set.

* The engine is operating in Closed Loop.

* The Ignition voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 3-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

P0132, P0138, P0152, or P0158

* DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135 or P2176 is not set.

* The engine is operating in Closed Loop.

* The Ignition voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 0-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

Conditions for Setting the DTC

P0131, P0137, P0151, or P0157

* The ECM detects that the HO2S voltage is less than 50 mV.

* The DTCs set within 100 s when the above condition is met.

P0132, P0138, P0152, or P0158

* The ECM detects that the HO2S voltage is greater than 1,050 mV.

* The DTCs set within 15 s when the above condition is met.

Action Taken When the DTC Sets

DTCs P0131, P0132, P0137, P0138, P0151, P0152, and P0158 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0131, P0132, P0137, P0138, P0151, P0152, and P0158 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 Control Module References for scan tool information

Circuit/System Verification

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

• If a 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 HO2S Bank 1 or 2 Sensor 1 or 2 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

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 5 ohms between the low reference circuit terminal A and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

3. Ignition ON, verify the appropriate scan tool B52 HO2S voltage parameter is approximately 450 mV.

• If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

• If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

4. Install a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the appropriate scan tool B52 HO2S voltage parameter is less than 60 mV.

• If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

5. If all circuits test normal, replace the appropriate B52 Heated Oxygen Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) Service and Repair

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) Service and Repair

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) Service and Repair

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) Service and Repair

* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.

* Control Module References Control Module References for ECM replacement, programming and setup.

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