OBD-II Trouble Codes

P0041 Code: O2 Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2

Reading Time: 3 minutes

The engine has many components and sensors that work together to ensure that your vehicle is running as it should. Some of the most crucial sensors to the operation of the engine are the oxygen (O2) sensors in the exhaust.

Oxygen sensors are mounted in the exhaust manifold or located downstream from the manifold in the exhaust pipe. They monitor the amount of oxygen in the exhaust and send this information to the vehicle’s powertrain control module (PCM). The PCM uses this data to calculate and adjust the amount of fuel injected into the engine.

P0041 is one of the several on-board diagnostic (OBD) trouble codes related to a possible fault in oxygen sensor signals. Read on to learn more about this code.

What Does the P0041 Code Mean?

Diagnostic Trouble Code (DTC) P0041 stands for “O2 Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2.” This code is set once the PCM detects that the wiring of the oxygen sensors downstream from the catalytic converter may have been swapped or crossed.

The PCM uses data from the upstream oxygen sensors to calculate how much fuel needs to be injected into the engine. Meanwhile, the module primarily uses the signal from the downstream sensors when calculating catalytic converter efficiency. The module can detect whether the oxygen sensor wiring has been swapped based on a simple logic test. If the PCM injects more fuel into bank 2 of the engine but notices that the bank 1 oxygen sensor is reacting instead of the sensor on bank 2, it will set code P0041.

Although P0041 is a generic code, it is considered uncommon. It may only appear on vehicles with more than one bank of cylinders.

oxygen sensor in exhaust pipe car
The PCM uses data from the upstream oxygen sensors to calculate how much fuel needs to be injected into the engine.

Note: The definition of code P0041 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0041 Code?

Here are some common causes of the engine code P0041:

What are the Common Symptoms of the P0041 Code?

Here are the common symptoms associated with this code:

How to Diagnose the P0041 Code

oxygen sensor wire connector car
Crossed, damaged, or shorted O2 sensor #2 wirings may set the P0041 code. To help you diagnose the problem accurately, consult the appropriate repair manual or have a certified professional do the job for you.

Diagnosing a P0041 code can be tricky without the proper tools or know-how needed to identify what is causing the problem.

If you’re not well-versed in auto repair, it is best to leave the job to a professional. However, if you would like to diagnose this code yourself, we recommend consulting a vehicle-specific repair manual or an online repair database for the proper diagnostic procedure.

How to Fix the P0041 Code

There is no universal fix for a P0041 code. The exact diagnostic and repair procedures for this code may vary depending on your vehicle’s year, make, and model. For example, repair procedures for a P0041 Audi code may prove different from a P0041 BMW code.

If you’re an advanced DIYer who’d like to try and fix this code yourself, we recommend consulting a vehicle-specific repair manual or getting a subscription to an online repair database.

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