What is the P0036 fault number? What is the malfunction description for the Oxygen Sensor, (HO2S), Heater Control Circuit (Bank 1)? How do I fix the P0036 fault code What are the causes and symptoms of the P0036 error code?
What is the P0036 Fault code? What does it signify?
If the powertrain controller module (PCM), detects an oxygen sensor heater control circuit problem in “Bank 1 Sensor 2”, a P0036 code is generated. “Bank 1” refers to the engine bank in which the number 1 cylinder of the engine is located. “Sensor 2”, also known as the downstream sensor, is the sensor located after the catalytic convert.
Most modern vehicles use heated oxygen sensors to rapidly bring the oxygen sensor to operational temperature. For the engine’s quick entry into the closed loop system and fuel injection calculations to be accurate, the O2 sensors must reach operating temperature as soon as possible.
The downstream oxygen sensor is used primarily to test the efficiency and effectiveness of the catalytic conversion. It measures the oxygen content of the exhaust gases that leave the catalyst. The PCM controls the heater circuit, which allows the sensor quickly to reach its operating temperature. Based on engine load and engine coolant temperature, the PCM controls the heater circuit for the oxygen sensor.
To send the correct voltage signals to a PCM, the HO2S must be at its optimal operating temperature. It will send information faster and more accurately if it reaches that temperature sooner than it does otherwise. This is possible because the heater circuit reduces the time required for it to occur.
The PCM stores the P0036 fault code and lights the check engine light if it detects that the signal is not correct or missing.
What causes the P0036 Fault code?
- – Defective oxygen sensor (Bank 1 Sensor 2)
- – Damaged wiring or loose connections may cause problems with the O2 sensor heater circuit.
- – If possible, blow the fuse in the oxygen sensor heater circuit.
- – A PCM that is not working properly or requires a software upgrade (rarely).
What are the symptoms of the P0036 Fault Code?
You may not feel any symptoms if the code P0036 is set.
- – Illumination for the check engine light
- Depending on the manufacturer’s instructions, some vehicles can enter safe mode.
Note: This sensor is located after the catalytic convertor and is used for evaluating the effectiveness of the catalyst. It will not have any effect on the fuel/air mixture. The PCM uses the pre-catalytic converter (upstream oxygen sensor) to determine the air/fuel mixture.
How do I fix the P0036 fault code?
- Road testing should be done to determine if fault codes will return.
- – Inspect the wiring and connectors for the oxygen sensor if the code is returned. Broken, damaged, melted, corroded or stripped cables should be repaired. Connectors that are loosely or badly connected should be replaced.
- – It is important to test the ground and power circuit signals that are connected to the heater of the sensor. Repairs must be made if there is a problem with the circuits. A heater circuit within the sensor should provide some resistance. If there is excessive resistance or a high limit reading, it will be a sign that the oxygen sensor has failed and must be replaced.
- – Some heater oxygen sensors may be fused. If the fuse is blown, it should be replaced and checked.
- – The oxygen sensor that is defective must be replaced.
- – When there is no power at the connector, it may indicate a problem in the power supply circuit or the PCM.
How serious is the P0036 Fault code?
You can drive the vehicle with the P0036 fault code. But it could reduce the effectiveness of your catalytic converter. It should be repaired immediately to avoid damage to other components.
