Causes And Fixes Of The P1157 Honda Accord Error

The P1157 Honda Accord error is a common source of concern for many Honda owners, causing unnecessary stress. This specific error code, which is related to the vehicle’s O2 sensor, can appear for a variety of reasons, ranging from faulty wiring to incompatible parts. Investigating its underlying causes and potential solutions can save both time and money. In this article, we’ll solve the mystery of this error by providing a step-by-step guide to diagnosing and fixing it.

Causes And Fixes Of The P1157 Honda Accord Error

How to Fix
Faulty O2 Sensor
Replace the primary O2 sensor with a model compatible with your Honda Accord.
Wiring Issues
Thoroughly inspect the O2 sensor’s wiring connections and replace or fix compromised sections.
Non-Compatible Aftermarket Parts
Opt for Original Equipment Manufacturer (OEM) O2 sensors to ensure compatibility.
ECU Sensitivity
Consult with a Honda specialist to determine if the ECU needs recalibration or replacement.

Causes Of The P1157 Honda Accord Error

  • Faulty O2 Sensor
  • Wiring Issues
  • Non-Compatible Aftermarket Parts
  • ECU Sensitivity
P1157 Honda Accord Error

Faulty O2 Sensor

The most obvious cause of the P1157 Honda Accord error is a faulty primary O2 sensor. This sensor, which is part of the car’s exhaust system, is critical in monitoring the amount of oxygen in the exhaust gases. A faulty sensor can send incorrect data to the car’s computer, resulting in the error.

Wiring Issues

The quality of electrical components is only as good as their connections. The wiring connected to the O2 sensor may deteriorate, corrode, or even break over time. If the sensor’s wiring becomes faulty, it can result in faulty or no signals at all, resulting in the P1157 Honda Accord error.

Non-Compatible Aftermarket Parts

Honda Accords, particularly older models, can be picky about replacement parts. Even if the sensor is functioning properly, using non-OEM (Original Equipment Manufacturer) O2 sensors can cause compatibility issues. The error could occur because the car’s system does not recognize or misinterprets readings from an aftermarket part.

ECU Sensitivity

Many of the car’s operations are controlled by the Engine Control Unit (ECU). The ECU in certain Honda Accord models may be overly sensitive and refuse to accept specific O2 sensors, even if they are in perfect working order. This increased sensitivity could be another cause of the P1157 Honda Accord error.

How To Fix The P1157 Honda Accord Error?

  • Replace the O2 Sensor
  • Inspect and Fix the Wiring
  • Use OEM O2 Sensors
  • Check the ECU
How To Fix The P1157 Honda Accord Error

Replace the O2 Sensor

One of the simplest ways to address the P1157 Honda Accord error is by replacing the primary O2 sensor. Since this is a common culprit, it’s often the first line of action for many car owners.


When sourcing a new O2 sensor, always ensure it’s compatible with your Honda Accord model. Some sensors may seem similar but may not function optimally with your specific vehicle version.

Inspect and Fix the Wiring

Over time, wiring can become damaged or corroded. To rectify the P1157 Honda Accord error caused by wiring issues, one should thoroughly inspect the O2 sensor’s wiring connections. If there’s any visible damage or degradation, consider redoing the wiring or replacing the compromised sections.


Always ensure that the wiring is secured away from heat sources and moving parts. This can extend the life of the wiring and reduce chances of damage.

Use OEM O2 Sensors

As Honda Accords can be sensitive to aftermarket parts, it’s always a safe bet to use Original Equipment Manufacturer (OEM) O2 sensors. While these might be a tad more expensive than third-party options, their compatibility is typically guaranteed.


If you’re uncertain about which sensor to purchase, consult your vehicle’s manual or reach out to the manufacturer. They can provide specifics about the ideal O2 sensor for your car model.

Check the ECU

If you’ve addressed the O2 sensor and the wiring but still face the P1157 Honda Accord error, the issue might lie with the Engine Control Unit (ECU). The ECU’s sensitivity can sometimes reject certain O2 sensors. In such cases, consider consulting with a Honda specialist or dealership to determine if there’s a need to recalibrate or replace the ECU.


Regularly updating your ECU’s software can help in ensuring it recognizes and works optimally with all the car’s components. If possible, schedule periodic checks with your local car service center.


What Is The Primary Cause Of The P1157 Honda Accord Error?

The main culprit is usually a faulty primary O2 sensor. However, wiring issues and non-compatible parts can also trigger this error.

Can I Use Aftermarket O2 Sensors For My Honda Accord?

While they might be more affordable, many Honda Accord models, especially up to the 2007 Honda Accord P1157, are sensitive and may not accept non-OEM sensors.

Is The P1157 Error A Common Issue For Honda Accords?

Not particularly. While some owners might face this issue, OEM sensors are robust and rarely fail. Thus, this error isn’t widespread.


The P1157 Honda Accord error can be daunting, but with the right knowledge and approach, it’s manageable. Whether you’re facing a sensor issue or a wiring problem, understanding the root cause is half the battle. Opt for OEM parts to ensure compatibility, and if in doubt, always consult with a Honda specialist. Safe driving!

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Ammar Masoud

I have had a long and fulfilling career in the automotive industry, primarily with Honda and Acura. With 15 years of experience as a Honda service technician, I became highly skilled in repair and maintenance, gaining a deep understanding of these vehicles. After many years in the automotive field, I decided to embark on a second career in industrial manufacturing. It was a significant change, but I found that the skills I had honed in the automotive industry were incredibly valuable in my new role. In my current position in industrial manufacturing, the demand for quality workmanship and meticulous attention to detail is paramount. Fortunately, these are traits that I have cultivated throughout my years in the automotive industry. I take pride in applying these skills to meet the high standards expected in the manufacturing sector.