P0155 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0155 – O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1

 

P0155: DIY Repairing Video Tutorial

https://youtu.be/Z7ntpSlq4Ls

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P0155 Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light),Possible higher fuel consumption,Possible more smoke from exhaust than usual  

P0155 Possible Causes

  Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1,Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse,Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground,Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection,Faulty Engine Control Module (ECM)  

P0155 Description

  Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.