P0141 Code - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2

What Does P0141 Mean?

Modern vehicles use both an upstream and downstream oxygen sensor. The upstream oxygen sensor (O2S) is located ahead of the catalytic converter. It is used to determine the concentration of oxygen in the exhaust gas. This information is used by the PCM to control the engine air/fuel mixture. The sensor compares amount of oxygen in the exhaust to the surrounding air (there is an opening in the sensor that is exposed to the atmosphere). It generates a corresponding voltage which is transmitted to the PCM. The PCM then controls injector pulse based on this value.

The downstream oxygen sensor is located behind the catalytic converter and is used to check converter efficiency. It does so by checking the oxygen content of the exhaust after it leaves the converter. For this reason, downstream O2 sensors are known as catalyst monitors.

Modern vehicles use heated oxygen sensors (HO2S). These sensors contain a heating element that brings the sensor to operating temperature faster. This allows the PCM to use the signals input sooner, for more precise fuel control and reduced emissions. The heater circuit is energized through a relay that closes when the engine is cranked. The PCM monitors the heater circuit and will turn on the check engine light if it finds a problem.

Code P0141 stands for HO2S heater Performance Bank 1 Sensor 2. This indicates the PCM has detected a problem with heater circuit of the downstream oxygen sensor. Bank 1 refers to the side of the engine that has the #1 cylinder. Bank 2 is the opposite side of the engine. If you’ve got a four-cylinder, there will only be one bank. The related code for the other bank is P0161 HO2S Heater Performance Bank 2 Sensor 2. This indicates the PCM has detected a problem with the bank 2 downstream oxygen sensor heater.



Oxygen sensor diagram

engine code P0141	P0141 fix	obd P0141	dtc P0141
obd code P0141	obd2 P0141	P0141 car code	diagnostic code P0141
car code P0141	check engine code P0141	fehlercode P0141	P0141 fiat
codigo P0141	codigo falla P0141	P0141 kody b??dów	codigo de falla P0141

What are the common causes of P0141 ?

• A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
• Some aftermarket accessories and performance modifications
• Dirty air cleaner element Damaged DPF

What are the symptoms of P0141 ?

These could include a lean or rich condition in the engine, decreased fuel efficiency, black smoke from the tailpipe, and an illuminated service engine soon lamp.

How do you troubleshoot P0141 ?

• Clearing the fault codes and performing a road test to try and verify a failure
• Replacing the O2 sensor for bank 1 sensor 2
• Repairing or replacing the wiring or connection to the O2 sensor for bank 1 sensor 2
• Replacing the fuse to the heater circuit for the O2 sensor heater circuit

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