What is OBD-II Code P22B2 – O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 2

What is OBD-II Code P22B2 – O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 2

If you own a car, it is safe to assume that you have seen or heard about the term OBD-II code. An OBD-II code is an error code triggered by the car’s onboard diagnostic system. This code appears when a problem occurs in the car’s engine, transmission, or other critical systems. An OBD-II code is your warning signal that there is an underlying problem in your car that requires immediate attention.

OBD-II codes come in several types, with each code representing a specific issue. One such OBD-II code is P22B2, which represents the O2 sensor negative current control circuit/open bank 1 sensor 2. In this article, we will explain what the P22B2 code means, how it impacts your car, and what you can do to repair the issue

What is the P22B2 OBD-II Code?

All modern vehicles come equipped with an onboard diagnostic (OBD-II) system that monitors various components and systems of the vehicle. This system is responsible for identifying issues that develop in the car, recording them as OBD-II codes, and displaying them on the vehicle’s dashboard.

The P22B2 OBD-II code relates to the negative current control circuit on the bank 1 sensor 2 oxygen sensor in the exhaust system. The oxygen sensor plays a crucial role in controlling the emissions from your vehicle. It measures the level of oxygen in the exhaust and sends a signal to the engine control module (ECM) to adjust the air-fuel ratio to the optimal level. If you see this code on your car’s dashboard, it means that there is an issue with the oxygen sensor in your vehicle’s exhaust system, specifically bank 1 sensor 2.

What Causes the P22B2 OBD-II Code?

The P22B2 OBD-II code is caused by a malfunctioning oxygen sensor in the exhaust system. This malfunctioning oxygen sensor is caused by a problem in the negative current control circuit. This circuit is responsible for regulating the voltage supplied to the oxygen sensor. If the voltage supplied to the sensor does not match the required voltage levels, the code will trigger.

The most common cause of this problem is a damaged or worn out oxygen sensor. The sensor may be damaged due to age or because of exposure to contaminants in the exhaust gases. The other culprit could be a defect in the sensor’s wiring or a fault in the car’s electronic control module.

Symptoms of a P22B2 OBD-II Code

The most common symptom of a P22B2 OBD-II code is the check engine light coming on, which is typically the first indication that there is an issue with your vehicle. Other symptoms include:

● A decrease in fuel efficiency

● Reduced Engine Performance

● Poor acceleration when accelerating

● Rough idling

● Difficulty Starting the Car

If you notice any of these symptoms accompanied by a Check Engine light, it is crucial to get your car checked by an experienced mechanic as soon as possible.

How to Fix the P22B2 OBD-II Code?

Fixing the P22B2 OBD-II code is not an easy fix as it requires an in-depth understanding of the car’s exhaust system and experience handling electronic sensors. The first step in fixing this issue is to find out what is causing the problem. This step requires the use of an OBD-II scanner capable of reading the code and diagnosing the problem.

Once the problem has been diagnosed, the next step is to replace the oxygen sensor. Oxygen sensors are relatively cheap and can be easily found at most auto parts stores. However, you must ensure that you get the right sensor for your vehicle. Moreover, it would be best to replace both bank 1 sensor 2 and bank 2 sensor 2 at the same time. This will save you time and money in the long run.

If the problem persists after replacing the sensor, the issue could be related to a faulty wiring harness or a problem with the car’s electronic control module. In this case, you will need to take your car to a professional mechanic to identify the specific issue correctly.

Frequently Asked Questions

1. Can I fix the P22B2 OBD-II code myself?
It is not advisable to attempt to fix the P22B2 OBD-II code yourself unless you have experience handling electronic sensors or have undergone professional training in vehicle repair.

2. How much does it cost to fix the P22B2 OBD-II code?
The cost of fixing the P22B2 OBD-II code varies depending on the specific issue causing the problem. However, expect to pay between $100 to $300 to replace the oxygen sensor.

3. Will the P22B2 OBD-II code cause harm to my car?
A P22B2 OBD-II code does not necessarily harm your car, but it could cause other related problems if left unattended. For example, a bad oxygen sensor could cause your car to perform poorly or lose fuel efficiency.

4. Will an OBD-II scanner detect the P22B2 OBD-II code?
Yes, one of the primary functions of most OBD-II scanners is to discover OBD-II codes caused by errors in various systems, including the oxygen sensors.

5. Can I still drive my car if the P22B2 OBD-II code comes up?
You can, but it is not recommended to drive the car if possible. The best practice is to have the car checked by a qualified mechanic first before continuing to use it.


The P22B2 OBD-II code is a warning sign that there is an issue with your car’s oxygen sensor, specifically bank 1 sensor 2. This code could be caused by damaged or worn-out sensors, faulty wiring, or defects in the electronic control module. It is crucial to address the issue as soon as possible to prevent possible problems with engine performance and fuel efficiency. If you notice a P22B2 OBD-II code appear on your dashboard, take your car to a professional mechanic to identify the issue and fix it as soon as possible.

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