What is the P0155 fault code? How to Fix the P0155 Fault Code

What is the P0155 fault code What is the Oxygen Sensor Heating Circuit Malfunction (Bank 2, sensor 1)? How can you fix P0155 fault code What are the causes and symptoms for the P0155 fault code

What is the P0155 fault code? What does it all mean?

A heated oxygen sensor (HO2S), is a sensor that detects heat in modern vehicles. The heating part of the sensor allows for the sensor to reach an operating temperature quicker.

A P0155 is an indication that the oxygen sensor heater is taking longer to warm up than normal. The fault code P0155 will be stored in the memory of the power control module (PCM). It will then illuminate the check engine lamp to alert the driver.

An oxygen sensor monitors the oxygen levels in the air entering the catalytic converter. This data is transmitted to the engine control module to determine catalytic converter efficiency. To adjust the engine’s fuel-to-air ratio, the PCM also uses data from an upstream O2 sensor.

The ideal operating temperature is the only way that sensors will work. The heating circuits controlled through the PCM speed up their temperature.

“Sensor 1”, the O2 sensor that precedes the catalytic convert, is called the sensor. “Bank 2”, which indicates the side where cylinder 2 is found, refers to the engine.

The PCM checks the heater circuits regularly to make sure the oxygen sensors work correctly. It will set code P0155 if it finds a problem with the heater circuit in the second row of the engine oxygen sensor. This is based on coolant temperature.

What is the P0155 Fault Code and Why Does It Happen?

P0155 fault codes can be caused by a variety of reasons. These may vary depending upon the vehicle’s make and model. These are some possible reasons this error code might appear:

– Defective oxygen sensor (bank 2 sensor 1)
– The oxygen sensor wires may be corroded or broken.
– Short or open circuit in the sensor circuit
– Oxygen sensor heater fuse blown
– Defective oxygen sensor heater
– The engine coolant sensor is not working as it should
Low battery voltage
– The hose connecting to the EGR system module’s exhaust gas recirculation (EGR), is not connected
– Low Probability: Defective Engine Control Module

What are the symptoms for P0155 fault code?

The Fault code P0155 might not be causing any symptoms. The most common symptoms are:

– Illumination for the check engine light
– Vehicle needs to be worked hard
– Increased fuel use
– An increase in emission values
– Engine stalling sometimes
– The exhaust emits a rotten egg smell and black smoke.

How to Fix the P0155 Fault Code

– Make sure to inspect the oxygen sensor wires for damage and wear.
If the engine coolant temperature sensor has stopped working, this code can be set. This sensor must also be checked.
If everything is in order, you should replace the oxygen sensor.
– The O2 sensor should not be changed if the code returns. In this case, the PCM must be replaced.