What is OBD-II Code P241A – O2 Sensor Signals Swapped Bank 1 Sensor 1/Bank 1 Sensor 2

What is OBD-II Code P241A – O2 Sensor Signals Swapped Bank 1 Sensor 1/Bank 1 Sensor 2

OBD-II codes are diagnostic trouble codes that tell mechanics and vehicle owners what went wrong with their vehicle. Code P241A is one such code that can be seen on OBD-II scanners and is also known as O2 Sensor Signals Swapped Bank 1 Sensor 1/Bank 1 Sensor 2. In this article, we will discuss what this code means, its symptoms, and how to repair it.

What is Code P241A?

Code P241A indicates that there is an issue with the oxygen (O2) sensors’ signals’ placement in Bank 1 Sensor 1 and Bank 1 Sensor 2. In simple terms, the computer in your vehicle is receiving the O2 sensor signals from the wrong sensors. Bank 1 refers to the engine bank that includes cylinder number 1, and sensors 1 and 2 are before and after the catalytic converter, respectively.

Symptoms of Code P241A

When this code appears on your OBD-II scanner, you may not experience any obvious symptoms with your vehicle. However, there are some signs that you can look out for that may indicate a problem, like:

1. Check Engine Light: The check engine light is the first sign that something is wrong with your vehicle. It illuminates when your vehicle’s computer detects an issue.

2. Poor Fuel Efficiency: When the O2 sensors swap signals, it can lead to incorrect readings, leading to poor fuel efficiency.

3. Rough Idling: Swapped signals could negatively affect the Engine Control Module’s decisions, leading to rough idling.

4. Engine Misfires: A swapped signal can cause the engine to malfunction, leading to engine misfires.

Causes of Code P241A

The most common cause of code P241A is a problem with the O2 sensor wiring. Here are some common causes of this code:

1. Damaged Wiring: Wiring issues in the engine or damage can cause your sensors swapping signals.

2. Sensor Faults: A faulty O2 sensor can also cause this code. If the sensors send signals that are out of range, your vehicle’s computer may assume they are from the wrong sensors.

3. Catalytic Converter Problems: If there is an issue with the catalytic converter, it can cause the O2 sensor signals to swap.

Repairing Code P241A

Before attempting any repairs, ensure that the wire connections and O2 sensors are working adequately and meet manufacturer specifications. Here are some ways to repair this code:

1. Repairing Damaged Wiring: The first step in repairing the P241A code is to check the wiring for any damages and repair it.

2. Replacing the O2 Sensor: The sensor may need to be replaced if faulty and is responsible for the signals swapping.

3. Catalytic Converter Replacement: If there is a problem with the catalytic converter, it may have to be replaced since it can affect the O2 sensor signals.


Q1. Will code P241A turn off its own?
Ans: No, the code will not disappear itself. You will need to find the root cause of the problem and fix it to clear the code.

Q2. Can I ignore code P241A?
Ans: Ignoring Code P241A and running your vehicle can cause significant problems with its performance and fuel efficiency. It is recommended to fix this code as soon as it appears.

Q3. Is code P241A a serious issue?
Ans: Code P241A is not considered a severe problem but can lead to other severe problems with your vehicle’s engine and fuel efficiency if left untreated.

Q4. What is the cost to fix code P241A?
Ans: The cost of fixing code P241A varies depending on the issue, but it can cost around $100 – $500 in most cases.

Q5. What causes swapped O2 sensor signals?
Ans: Swapped O2 sensor signals can be caused by various factors, including faulty sensors, engine wiring faults, and catalytic converter problems. Repairing these issues can solve the problem.


In conclusion, Code P241A is a relatively common code that can appear on your OBD-II scanner. Opting to ignore this code can negatively affect your car’s engine and fuel economy. This article has provided insight into the meaning of the code, its symptoms, causes, and how to fix it. Remember to take all necessary safety precautions before attempting any repairs and seek professional help if necessary.

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