P0155: O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
Is your scanner showing P0155?
No worries. We'll show you what it means and how to deal with it.
P0155: O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
OVERVIEWWhat Does The P0155 Code Mean?
This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it.
The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155.
What Are The Symptoms Of The P0155 Code?
You will likely notice poor fuel economy the illumination of the MIL.
What Are The Potential Causes Of The P0155 Code?
A code P0155 may mean that one or more of the following has happened:
- O2 Heater element resistance is high
- Internal short or open in the heater element
- O2 heater circuit wiring high resistance
- Open or short to ground in the wiring harness
How Can You Fix The P0155 Code?
- Repair short or open or high resistance in wiring harness or harness connectors
- Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> O2 Sensor
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Dorman 86689C 399 PC Automotive Electrical Repair Kit
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
