What is OBD-II Code P241B – O2 Sensor Signals Swapped Bank 2 Sensor 1/Bank 2 Sensor 2

When your check engine light comes on, it’s important to take it seriously. The OBD-II system is a vital component of your vehicle, constantly monitoring various systems and issuing warning codes if there is a problem. One common code is P241B – O2 Sensor Signals Swapped Bank 2 Sensor 1/Bank 2 Sensor 2. This code is related to the oxygen sensors in your car and can be a sign of a more significant problem. In this article, we’ll explain what OBD-II Code P241B is, what causes it, and how to repair the issue.

What is OBD-II Code P241B?

OBD-II Code P241B refers to a problem with the oxygen sensors in your vehicle. Specifically, it indicates that the O2 sensor signals have been swapped between Bank 2 Sensor 1 and Bank 2 Sensor 2. In most modern vehicles, Bank 2 refers to the side of the engine opposite the number one cylinder. This code is common in vehicles with V6, V8, and V10 engines.

The oxygen sensors play a critical role in regulating your vehicle’s air/fuel mixture. They measure the amount of oxygen in the exhaust and send a signal to the engine’s computer to adjust the mixture accordingly. If the sensors aren’t working correctly, your car may not run efficiently, and you may experience reduced fuel economy and increased emissions.

What causes OBD-II Code P241B?

Several factors can cause OBD-II Code P241B. The most common cause is a wiring issue. The sensors are connected to the engine’s computer via wiring, and if there is a problem with these connections, it can cause the sensors to send the wrong signals. Another common cause is a faulty O2 sensor. Over time, these sensors can wear out and fail, causing issues with the signals they send.

Other possible causes include a damaged or clogged catalytic converter, a vacuum leak, or a faulty engine control module. It’s essential to diagnose the root cause of this code to ensure that you make the correct repairs.

How to repair OBD-II Code P241B

The first step in repairing OBD-II Code P241B is to diagnose the root cause of the problem. This is typically done using a diagnostic scanner that connects to your car’s OBD-II port. The scanner will provide more detailed information about the issue, allowing you to make the necessary repairs.

If the problem is related to the wiring, the damaged connections will need to be replaced or repaired. If it’s a faulty O2 sensor, the sensor will need to be replaced. If your catalytic converter is damaged or clogged, it may need to be replaced as well.

In some cases, updating the engine control module’s software can resolve the issue. However, this is not always the case, and you’ll need to have a trained mechanic diagnose and repair the problem.

Frequently Asked Questions

1. How do I know if my oxygen sensors are faulty?

One sign that your oxygen sensor is faulty is if your check engine light comes on. However, this isn’t always the case. Other signs may include reduced fuel economy, rough idling, or stalling.

2. Can I continue driving with OBD-II Code P241B?

It’s not advisable to continue driving with this code, as it can cause long-term damage to your vehicle’s emissions system and reduce its performance.

3. How much does it cost to repair OBD-II Code P241B?

The cost to repair this code can vary widely, depending on the root cause of the problem. Repairs may range from a few hundred dollars for a faulty sensor to several thousand dollars for a damaged catalytic converter.

4. Can I fix OBD-II Code P241B myself?

Unless you’re a trained mechanic, it’s not advisable to attempt to fix this code yourself. The root cause of the problem can be challenging to diagnose, and repairs may require specialized tools and equipment.

5. How often should I replace my oxygen sensors?

Most manufacturers recommend replacing your oxygen sensors every 60,000 to 100,000 miles. However, this can vary depending on your driving habits and the type of vehicle you have.

Case Study

A customer brought their 2007 Ford F-150 into our shop with a check engine light on. Using our diagnostic scanner, we found that the code was OBD-II Code P241B – O2 Sensor Signals Swapped Bank 2 Sensor 1/Bank 2 Sensor 2. After checking the wiring and the sensors, we found that the problem was with the engine control module’s software. We updated the software and cleared the code, and the customer didn’t experience any further issues.


If you want to learn more about the OBD-II system and troubleshooting common issues, several resources can provide more information. The National Institute for Automotive Service Excellence (ASE) offers training and certification in automotive repair, and their website has a wealth of information on diagnosing and repairing common issues. Additionally, many auto manufacturers have online resources and forums where you can ask questions and get advice from other enthusiasts and professionals.

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