P0141 Fault Code

Long Description

Fault code P0141 is logged when the engine control module (ECM) has detected a malfunction with the oxygen sensor heater circuit. It is specific to oxygen sensor 2 in bank 1 of the engine.

This happens if the ECM detects an open or short circuit condition or unexpected current being drawn by the sensor.

Bank 1 refers to the side of the engine in which cylinder 1 is located. This can be found in the owner’s manual. Oxygen sensor 2 is the downstream sensor.

Other codes that represent malfunctions in these circuits are P0135, P0155, and P0161.

A faulty sensor can cause the vehicle to run improperly as the ECU is being fed incorrect information.

Opel and Vauxhall are the most commonly reported manufacturers to have this fault code. Honda is also another manufacturer that is searched alongside this code fairly regularly.

Other Signs of This Problem

There are a number of signs that can give away an issue with a heat oxygen sensor. These typically relate to how the engine runs.

One of the most obvious signs is that the Check Engine light will be illuminated – followed by this P0141 fault code being displayed on an OBD2 reader.

The vehicle may also be running excessively rich. This means there is too much fuel being fed to the combustion chambers at any given time, disrupting the ideal air-fuel ratio.

This can lead to poor fuel economy and carbon buildup on all parts that come into contact with the combustion gases and exhaust fumes.

Additionally, the engine running rich can cause spark plugs to foul out quickly. This can mean the vehicle struggles to start up or misfire due to carbon buildup.

What Could Be The Problem?

There are only a few possible causes for this issue. These are entirely related to the electrical components and circuitry.

One of the most likely issues is a faulty downstream oxygen sensor. This will obviously provide an incorrect reading that can signal the fault code to be logged.

Additionally, there could be an issue with the wiring or connections. A frayed or damaged wire can disrupt the signal being sent.

This can also happen as a result of an open or short circuit in the wiring.

Fixes

All of the fixes for P0141 are focused on fixing any existing electrical issues. However, it is a good idea to reset the codes and perform a test drive to determine if the code is logged again.

If the oxygen sensor is in fact faulty, it should be replaced.

The wiring and connections between the sensor and the ECU should also be checked for damage or fraying. These should be fixed accordingly. It is also important to ensure that the connections are properly fixed to the components.

The fuse running to bank 1 sensor 2 should also be checked and replaced if need be.

Seriousness

Fault code P0141 should be considered a moderately serious problem. There is no immediate danger to the engine or its components but operating in this state can eventually cause damage.

It can also cause the vehicle to run very poorly after enough carbon buildup is caused. The fuel economy will also be very poor.

It should ideally be fixed as soon as possible.