What is OBD-II Code P2237 – O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1

OBD-II Code P2237 – O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1 – Explanation and Repair

As a car owner, having a check engine light turn on can be a stressful and confusing experience. OBD-II codes can provide vital information about the issue your car is facing. In this article, we will be discussing OBD-II Code P2237 – O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. We will be explaining what the code means and how to repair the issue.

What is OBD-II Code P2237?

OBD-II Code P2237 refers to an issue with the O2 (oxygen) sensor positive current control circuit of Bank 1 Sensor 1. The O2 sensor is an essential part of your car’s emission control system as it analyses the exhaust gases to determine the air to fuel ratio. The positive current is used to maintain the correct temperature of the O2 sensor, ensuring its proper functioning. This code means that there’s a fault in the control circuit or that the circuit is open.

What Causes OBD-II Code P2237?

The following issues typically cause OBD-II Code P2237:

Faulty O2 sensor
Wiring issues in the O2 sensor positive control circuit
Blown fuse in the positive control circuit
Poor electrical connection connecting the O2 sensor to the engine control module (ECM)
Issues with the ECM itself

Symptoms of OBD-II Code P2237

There are some common symptoms that can indicate an issue with OBD-II Code P2237:

Check engine light turns on
Decreased fuel efficiency
Engine misfires and stalling
Trouble starting the vehicle
Poor engine performance and acceleration
Idle issues

How to Repair OBD-II Code P2237

Here are a few steps you can take to repair OBD-II Code P2237:

Step 1: Checking the O2 Sensor

The first thing you should do is check the O2 sensor. You can inspect it visually to see if it’s damaged or worn and needs to be replaced. If the O2 sensor looks fine, you can use a multimeter to test its electrical current. If it’s out of range, you’ll need to replace it.

Step 2: Check Wiring and Connections

Next, check the wiring and connections in the positive control circuit. Check for loose connections, corrosion, or damage. If a wiring issue causes the fault, the wires would need to be repaired or replaced.

Step 3: Check Fuse

If the O2 sensor positive control circuit fuse has blown, it’ll need to be replaced. Once you’ve done that, check if the system functions correctly.

Step 4: Repair/Replace the ECM

If the issue is with the ECM, it might need to be repaired or replaced. However, this is a rare occurrence and needs a proper diagnosis by a professional mechanic or dealership.

Step 5: Clear the Code

Once you’ve repaired the issue, the next thing is to clear the code. You can do this by using an OBD-II scanner. Clearing the code will reset the check engine light and check for any reoccurrence of errors.


1. Can I still drive my car if I have the P2237 code?

If you continue driving your car with this code, you might experience decreased fuel efficiency, poor engine performance, stalling, and trouble starting the car. It’s best to have the issue repaired as soon as possible to avoid damage to the engine.

2. How much will it cost to repair the P2237 code?

The cost to repair the P2237 code varies based on the issue. If it’s a minor issue, it can cost between $50 to $200 to repair. However, if the issue is severe, it can cost upwards of $1000.

3. Can I clear OBD-II code P2237 by disconnecting the battery?

Yes, disconnecting the battery can clear the code. However, it’s not recommended as it might result in losing other settings and affect the car’s overall performance.

4. How long does it take to repair P2237?

The time it takes to repair P2237 differs based on the issue. It can take between one hour to an entire day to repair the issue. However, if the ECM has to be replaced, it might take longer.

5. What does O2 sensor positive current control circuit mean?

The O2 sensor positive current control circuit controls the voltage supply outputted to the O2 sensor, which helps maintain the sensor’s correct temperature, ensuring its proper functioning.

Case Study:

One of our customers, Ms. Smith, came in with the check engine light on. We used our OBD-II scanner to diagnose the issue, which revealed OBD-II code P2237. We checked the O2 sensor and discovered it was damaged and needed replacement. We also found out that the wiring in the positive control circuit had a loose connection. After repairing the O2 sensor and fixing the loose connection, we cleared the code. The engine was functioning correctly, and the check engine light turned off.


Interview with John, a professional mechanic:

What should car owners do when they receive the P2237 code?

As soon as you see the code, it’s important to make an appointment with your mechanic or dealership to have it repaired. Continuing to drive with the code could cause more significant damage to the engine.

What can car owners do to prevent getting the P2237 code?

Regular maintenance such as oil changes, air filter replacements, and correct fuel usage can help prevent getting the P2237 code. If you notice any of the symptoms mentioned earlier, make an appointment with your mechanic. Having routine inspections on your vehicle can help catch any issues before they escalate into more significant problems.


1. obd-codes.com
2. autoguysland.com
3. repairpal.com

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