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DTC P0036, P0037, P0038, or P0141

Heated oxygen sensors (HO2S) are used for fuel control and post-catalyst monitoring. The heated oxygen sensor (HO2S) 2 compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The heated oxygen sensor (HO2S) 2 must reach operating temperature to provide an accurate voltage signal. A heating element inside the heated oxygen sensor (HO2S) 2 minimises the time required for the sensor to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the heated oxygen sensor (HO2S) 2 heater low control circuit, through a low side driver within the engine control module (ECM). The ECM uses pulse-width modulation (PWM) to control the heated oxygen sensor (HO2S) 2 heater operation to maintain a specific heated oxygen sensor (HO2S) 2 operating temperature range.

P0036 00

The ECM monitors the voltage on the heated oxygen sensor (HO2S) 2 heater low control circuit for heater fault diagnosis. If the ECM detects that the heated oxygen sensor (HO2S) 2 heater low control circuit voltage is not within a specified range, DTC P0036 00 sets.

P0037 00

The ECM monitors the voltage on the heated oxygen sensor (HO2S) 2 heater low control circuit for heater fault diagnosis. If the ECM detects that the heated oxygen sensor (HO2S) 2 heater low control circuit voltage is below a specified range, DTC P0037 00 sets.

P0038 00

The ECM monitors the voltage on the heated oxygen sensor (HO2S) 2 heater low control circuit for heater fault diagnosis. If the ECM detects that the heated oxygen sensor (HO2S) 2 heater low control circuit voltage is above a specified range, DTC P0038 00 sets.

P0141 00

If the ECM detects that the heated oxygen sensor (HO2S) 2 heater current is not within the expected range, DTC P0141 00 sets.

P0036 00, P0037 00, and P0038 00

P0141 00 Heater Resistance Test

P0036 00, P0037 00, and P0038 00

P0141 00 Heater Resistance Test

DTC P0036 00, P0037 00, P0038 00, P0141 00 are Type B DTCs.

DTC P0036 00, P0037 00, P0038 00, P0141 00 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Clear the DTCs with a scan tool.
2. Operate the vehicle within the conditions for running and setting the DTCs. The DTCs should not set.

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the B52B Heated Oxygen Sensor 2.
2. Ignition ON, verify that a test lamp illuminates between the B52B Heated Oxygen Sensor 2 ignition circuit terminal 3 and ground.

⇒	If the test lamp does not illuminate, test the B52B Heated Oxygen Sensor 2 ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse is open, test all components connected to the fuse and replace as necessary.

3. Ignition ON, verify that a test lamp does not illuminate between the B52B Heated Oxygen Sensor 2 control circuit terminal 1 and the B52B Heated Oxygen Sensor 2 ignition circuit terminal 3.

⇒	If the test lamp illuminates, test the B52B Heated Oxygen Sensor 2 control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

4. Engine running, leave the test lamp connected from the previous step. The lamp should flash or be ON steady.

⇒	If the test lamp is not ON steady or flashing, test the B52B Heated Oxygen Sensor 2 control circuit terminal 1 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

5. If all circuits test normal, replace the appropriate B52B Heated Oxygen Sensor 2.

Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution in the Preface section.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.