Definition- “Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 2”
P0155 is a diagnostic trouble code that occurs when the powertrain control module checks the heating element of the oxygen sensor, which is present on bank 2 and detects excessive resistance or short circuit in the heater, it mainly occurs when the heater’s circuit does not function properly.
When this code is present, it means that the heating element of the oxygen sensor is taking more time to heat up than usual.
When this problem with the heater of the oxygen sensor will occur, the power control module will set the P0155 trouble code and will alert you through engine light.
The heated oxygen sensor measures the oxygen content present in the exhaust stream and the heating element in the oxygen sensor helps the sensor to get to the operating conditions in less time. If the heating element of the oxygen sensor will have any malfunctioning then it will heat up the sensor to operating conditions in more time.
There can be several reasons for the occurrence of this DTC code, some of them are below
The following things will indicate that your vehicle has this trouble
P0155 is not a serious DTC code and can not cause any harm to the driver, it is a moderate serious as it can cause drivability issues and less fuel efficiency in the vehicle.
On the other hand, it can cost a decent amount if not handled on time, as replacing the parts is very expensive, so you need to fix this code as soon as possible.
The ECM sets and stores all the trouble code relating to the troubles that your vehicle has and to read those codes you have to fix the code scanner or reader into your vehicle, you will see the trouble codes on the screen of the scanner, it can show more than one trouble code, remove all the other troubles before fixing P0155 trouble code, and now to fix P0155 code have a look on the fixes mentioned below.
To make your vehicle free from this trouble code try the following fixes
Check for all the wirings to the oxygen sensor and inspect them visually, if you find any damage in the connections of wires then replace them otherwise head towards other fixes.
The fluctuating voltage of the oxygen sensor can also set this trouble code, so kindly check the voltage of the sensor using a multimeter, the voltage can fluctuate because of the faulty wiring or damaged oxygen sensor. If you find this problem then repair them and then look at the code reader to ensure that the sensor is working as it should be or not.
If the problem persists even after repairing the sensor and its wiring then replace the oxygen sensor with a new working one, but before replacing be sure that you have checked the above-given things properly.
The fault can be in the engine coolant temperature sensor, as it will sense the wrong temperature and make the ECM set this code while detecting troubles. So check the ECT and if it is not working properly then replace it with a new one to resolve the issue.
After trying all the above fixes, diagnose the trouble codes again and if P0155 code still exists then it might be possible that there is some problem with the PCM of your vehicle and it is detecting the trouble codes wrongly, but it is a very rare case and apply this only when you have tried every other fix. To replace the power control module of your vehicle and again scan the codes.
The oxygen sensor is an essential part of the emission system of your car, emission system reduces the emission of poisonous gases into the atmosphere thus causing less air pollution, the oxygen sensor is present in the exhaust pipe of the cars, it measures the amount of oxygen present in the exhaust gases, in some cases, the oxygen sensor stops working and to check if your oxygen sensor is bad kindly follow these steps:
Yes, you can drive with a bad oxygen sensor, but replace it as quickly as possible because your vehicle will take more fuel which will cost you a lot, also if you ignore this problem it will cost very much to replace the sensor.