If the Verify Engine Light is certainly illuminating your dashboard and the OBD-II reader is displaying P0155, you probably want to know what this code means. If youre only interested in the codes most basic definition, well cut to the chase: its “O2 Sensor Heater Circuit Malfunction (B2S1)”. If, on the other hand, you want to know more, including the codes meaning, potential causes and exact diagnostic and repair steps, keep on reading.
The P0155 Diagnostic Trouble Code (DTC) is usually a generic powertrain code, meaning it applies to all vehicles equipped with the OBD-II system. Although generic, the specific repair steps for this DTC will vary from model to model (of the vehicle).
Back to that definition: “O2 Sensor Heater Circuit Malfunction (B2S1)”. To understand what the P0155 means, we need to break this down. Obviously, the 02 sensor part refers to the oxygen sensor; circuit malfunction is clear enough – somethings not working properly in the oxygen sensor circuit. As for those letters and figures, B2 and S1, they refer to the bank and the sensor, respectively. So the B2 refers to the Bank 2, but to find it, you have to know where the Lender 1 is. Luckily, thats not too hard, as the Bank 1 refers to the side of the engine that has the #1 cylinder; Lender 2 is therefore on the opposite side of the engine. If your vehicle has a four-cylinder, there is only one bank, which means you wouldnt get this code. As for S1 part of the definition, it refers to sensor #1.
There can be several known reasons for this DTC showing up, however the most common causes consist of:
So essentially, whenever your OBD-II audience/scanning device reveals the P0155 DTC, this means that whenever your vehicles powertrain control module acquired examined the O2 sensors heating unit circuit on Loan company 2, it observed an excessive level of resistance or brief in the heating unit element. This means O2 sensor acquiring longer to warm up and enter shut loop.
Normally, a failed O2 sensor network marketing leads to poor gasoline economy, nevertheless, its entirely possible to experience no symptoms at all when the P0155 code shows up, except for the illuminated Check Engine Light. Still, most drivers will experience a combination of the following symptoms:
In most cases, when the P0155 DTC shows up, the O2 sensor needs to be replaced. However, this is not always required, as sometimes the problem can lie in the catalytic converter, or an exhaust leak or damaged wiring or connections. For this reason, its crucial to inspect your vehicle thoroughly and pay attention not only to the O2 sensor, but to the other components of the car as well. However the P0155 code isn’t among the critical malfunctions, its still vital that you invest some time to correctly inspect, fix and test the automobile. So, if you don’t have a substantial amount of motor vehicle knowledge, its smart to let a specialist fix your vehicle.
Regardless, this is what you or your auto mechanic must do to inspect your automobile and repair the P0155 DTC:
To correctly diagnose and fix the P0155 code, an intensive inspection is crucial. Frequently, people will replace the O2 sensor before inspecting various other components which simply leads to raised fix costs and irritation.
To summarize, the following fixes can repair the P0155 DTC:
Because the code P0155 doesnt present danger to the driver, its not regarded as a serious DTC. It is, however, a moderately severe code. This is because it often causes drivability issues and poor gas economy. Plus, the longer you wait to fix it, the higher the restoration costs will become. Needless to say, its wise to cope with this code once you see it.
In the event that you dont very own an air sensor established and a propane container, removing the air sensor could be tricky. Because of this, its smart to let a specialist diagnose and fix the P0155 code.
These links provides more descriptive insights into what code means in your automobile:
Make sure to also read our important guide to the very best OBD2 Scanner.