P2237 code — how to fix error fast
Delving into the P2237 code can optimize oxygen sensor performance. Learn its nuances to ensure efficient combustion.
If you spot the P2237 code in your car after a diagnostic test, it won’t be long before the “check engine” light comes up as well. This code can directly alter the air/fuel ratio and you’ll need to know more about the P2237 code meaning if you wish to quickly get rid of the code.
Luckily, our team of seasoned automotive experts has decided to help you with this comprehensive guide on the P2237 code. We’ll discuss the issues that lead to the code, what you can do to fix it, and ways of prevention so it doesn’t happen again anytime soon.
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What does the P2237 code mean?
The P2237 code is an OBD-II diagnostic trouble code that indicates an issue with the oxygen sensor on Bank 1, Sensor 1. This sensor is responsible for monitoring the amount of oxygen in the exhaust gases and sending that information to the engine control module (ECM). When the sensor detects a voltage signal that is outside of the expected range, the ECM will trigger the P2237 code.
It’s important to fix the P2237 code as soon as possible because it can cause a decrease in fuel efficiency and engine performance. Additionally, if left untreated, it can cause damage to other engine components.
What causes the P2237 code?
The code P2237 can be caused by a variety of different reasons, and they could all lead to different symptoms of the code. So, you may experience poor fuel economy, decreased engine performance, rough idling, and even engine stalling. Knowing the symptom also helps determine the cause, and it gets even easier when you have a list of all the possible reasons at your disposal:
Problems with the oxygen sensor
A malfunctioning oxygen sensor can cause this code to appear. The sensor may be damaged, contaminated, or have a loose connection.
Wiring issues
Damaged wiring or loose connections in the oxygen sensor circuit can also trigger this code. If there are corroded wires or damaged wiring harnesses it could also lead to the sensor being inoperable and that could be the reason why it failed and caused the code P2237.
Problems with the PCM
The powertrain control module (PCM), which controls the fuel injection and ignition systems, may have failed. A failed PCM can cause problems with the oxygen sensor readings and trigger this code.
Exhaust leaks
Leaks in the exhaust system can cause inaccurate readings from the oxygen sensor, leading to this code. So, you may get the code stating that the oxygen sensor has failed, even though it may not be the case in reality and it’s just caused by imprecise readings.
Which car models does the P2237 code affect the most?
The P2237 code is most commonly found in Toyota, Lexus, and Honda vehicles. This is because these car models tend to have more issues with their oxygen sensors and exhaust systems. However, it can appear in other car models as well, so we’ve pulled out the data about the most commonly affected vehicles so you won’t have to:
- Honda Civic: This car uses a four-cylinder engine and has a single exhaust system which often leads to failed oxygen sensors and the code P2237.
- Subaru Impreza: This model is also affected by the code due to frequently failing oxygen sensors in the exhaust Bank 1.
- Subaru Legacy: The Legacy is often plagued by the same issues that affect the Impreza and that’s the reason why it could be compromised by the code P2237.
How to diagnose the P2237 code
Diagnosing the P2237 code requires a few specialized tools, including an OBD-II scanner and a multimeter. Here are the steps to diagnose the P2237 code:
Resistance testing
Resistance tests can be performed on the oxygen sensor circuit to check for any open circuits, short circuits, or high resistance. This can be done using a multimeter by measuring the resistance between various points in the circuit.
Checking the oxygen sensors
The oxygen sensor itself can be tested using a digital voltmeter or an oscilloscope. This involves measuring the voltage output of the sensor while the engine is running and comparing it to specifications.
Perform a smoke test to find exhaust system leaks
A smoke test can be done to identify any leaks in the exhaust system that may be causing inaccurate readings from the oxygen sensor.
How to fix the P2237 code
The potential fixes for the P2237 code depend on the underlying cause. Here are some potential fixes and cost estimates:
Oxygen sensor replacement
If the oxygen sensor is found to be faulty or damaged during diagnostic testing, it will need to be replaced. This is a relatively simple repair that involves removing the old sensor and installing a new one. It takes anywhere from $50 to $250 to replace a faulty oxygen sensor depending on the car model.
Repairing the wiring
If there is damage, corrosion, or a loose connection in the oxygen sensor wiring, it will need to be repaired or replaced. This may involve splicing in new wires or replacing entire sections of wiring.
Exhaust system repairs
If there are leaks in the exhaust system that are causing inaccurate readings from the oxygen sensor, these will need to be repaired. This may involve patching holes or replacing entire sections of exhaust piping.
How to prevent the P2237 code
The best way to prevent the P2237 code is to stay up-to-date with routine maintenance, so performing the following check-ups can help postpone or even prevent the code P2237:
- Regular oil changes and filter replacement
- Properly maintaining the oxygen sensor
- Checking the exhaust system
Doing these will help you easily avoid the code and it’s essential to check the affected components of the code after you’ve repaired them to clear it.
Our take
In conclusion, the P2237 code is a common issue that can cause decreased engine performance and fuel efficiency. By understanding what it means, its causes, and how to fix it, you can take the necessary steps to keep the vehicle running smoothly and efficiently.
We hope that this guide will help you with that cause, so make sure to thoroughly go through it to get a better understanding of the code.
What causes DTC P2237?
The most common causes of DTC P2237 are a faulty oxygen sensor, wiring issues, a failed powertrain control module (PCM), or exhaust leaks.
Can I still drive my vehicle with DTC P2237?
It’s generally safe to drive your vehicle with DTC P2237, but it’s important to have it diagnosed and repaired as soon as possible. Ignoring this code can lead to decreased fuel efficiency, increased emissions, and potential damage to other engine components.
How much does it cost to fix DTC P2237?
The cost of fixing DTC P2237 will depend on the root cause of the issue. Oxygen sensor replacement is a relatively simple repair that can cost around $100
to $300, while replacing the PCM can cost upwards of $1,000. It’s important to have your vehicle diagnosed by a qualified mechanic who can provide an accurate estimate.
