P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
OBD-II Trouble Code Technical Description
02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
What does that 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. See also: P0135 (Bank 1).
You will likely notice poor fuel economy the illumination of the MIL.
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
- 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)
Related P0155 DTC Discussions
- 97 Ford Taurus P0155 P0161 o2 sensor
I have a 1997 Ford Taurus and I am getting codes P0155 & P0161 These are for the bank 2 sensors 1 and 2. I have changed both sensors and checked wires and did voltage readings on them all seems good but the codes keep coming back. Anyone have any ideas why...
- GMC TERRAIN Multiple code p0050 p0152 p0154 p0155
Hi Guys, My GMC shows a check engine sign when I checked it with OBD 2 scanning tool, It reads four different codes P0050, P0152, P0154, PO155. I have tried to gather more details on all these code but I do not know where to start. Can someone help me? Is it safe to drive the car for now?? John...
- 99 Chevy k1500 throwing 3 similiar codes;P0134,P0154 & P0155
My 1999 Chevrolet K1500 keeps throwing the same three codes. 1. P0134 Bank 1 Sensor 1 2. P0154 Bank 2 Sensor 1 3. P0155 Bank 2 Sensor 1 Can anyone please help, is the problem the ECM? I find it hard to believe multiple O2 Sensors failed at the same time. If anyone has a explanation I would appreciat...
- BMW P0155 code will not clear
I have a 1997 BMW 328i with automatic transmission. While repairing a driveshaft issue, the exhaust bolts were heated with a torch. When the driveshaft was repaired the engine light came on. I checked the code with my OBDII and it revealed two codes. The first code was for the 02 sensor P0132 (I...
- P0155 after Long Tube Header install
Hi Everyone. I have a 2007 Mustang which I just recently had the American Racing Headers and high flow cats installed. Now I am getting the P0155 trouble code. Does this mean I need a tune or is there possibly an issue with the location of the O2 sensors? They relocated my front sensors to the end o...
Need more help with a p0155 code?
If you still need help regarding the P0155 trouble code, please post your question in our FREE car repair forums.
NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected. If you want to share this article or information with others, please link to this page, don't copy and paste it elsewhere.