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Engine-Codes – Honda – P2237 Honda

P2237 Honda Code - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage

Quick Answer

The P2237 code for Honda vehicles indicates an issue with the Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage. Common causes include Faulty rear air/fuel ratio sensor, Wiring issues or shorts, Issues with the engine control module. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P2237 Honda indicates Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage.
Common causes
Common causes include Faulty rear air/fuel ratio sensor, Wiring issues or shorts, Issues with the engine control module.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P2237 Honda Description

The P2237 code for Honda vehicles indicates an issue with the Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage. This sensor is responsible for monitoring the air-fuel mixture in the exhaust system and providing feedback to the engine control module. When the voltage from this sensor is too high, it can lead to incorrect readings and potentially impact the engine's performance.

OBDII Code P2237 Honda - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage
P2237 Honda Code - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 IP Line High Voltage

Common Causes of P2237 Honda

  1. Faulty rear air/fuel ratio sensor
  2. Wiring issues or shorts
  3. Issues with the engine control module
  4. Exhaust leaks near the sensor
  5. Contamination of the sensor by oil or other substances

Symptoms of P2237 Honda

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Check Engine Light illuminated
  5. Reduced overall engine performance

How to Fix P2237 Honda

  1. Begin by diagnosing the specific cause of the high voltage reading, which may involve testing the sensor, wiring, and engine control module.
  2. Replace the rear air/fuel ratio sensor if it is found to be faulty.
  3. Repair any damaged wiring or connections to the sensor.
  4. Clear the diagnostic trouble codes and reset the engine control module.
  5. Test drive the vehicle to ensure the issue has been resolved and the code does not reappear.

Cost to Fix P2237 Honda

The cost of repairing a P2237 code on a Honda vehicle can vary depending on the specific cause of the issue. In general, the cost of parts such as a new rear air/fuel ratio sensor can range from $100 to $300, while labor costs can range from $100 to $200. Overall, the total cost of repairing this issue is typically between $200 and $500. However, it is important to note that labor rates can vary based on location and the specific repair shop, so it is advisable to obtain a quote from a local mechanic for a more accurate estimate.

What does this mean?

Tech Notes for P2237 Honda

For the following Honda models:

2003–2005 Honda Accord V6s
2005 Honda Odysseys
2005 Honda Pilots
2006 Honda Ridgelines

To fix this problem, check the sensor wiring and connections for damage. If the sensor circuit is OK, and the DTC(s) come back after clearing them and doing a short test-drive, replace the A/F sensor. The replacement A/F sensors in Honda parts stock are an improved version over the original sensor.

When is the Code Detected?

If the IPB 1 terminal voltage is out of a specified range, the PCM detects a malfunction and stores a DTC.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2237 Honda Code

1. What are common symptoms of OBDII code P2237 in a Honda?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.

2. What does the OBDII code P2237 indicate in a Honda?

- OBDII code P2237 in a Honda indicates that the Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 is detecting a high voltage condition in the IP line.

3. What are possible causes of OBDII code P2237 in a Honda?

- Possible causes include a faulty rear air/fuel ratio sensor, wiring issues, exhaust leaks, or a problem with the engine control module.

4. How can I diagnose the cause of OBDII code P2237 in my Honda?

- You can start by inspecting the wiring and connections related to the rear air/fuel ratio sensor, checking for exhaust leaks, and testing the sensor itself using a multimeter.

5. Can I continue driving my Honda with OBDII code P2237 present?

- It is not recommended to drive your Honda with OBDII code P2237 present, as it can lead to poor engine performance and potentially cause further damage.

6. How can I repair OBDII code P2237 in my Honda?

- Repairing OBDII code P2237 typically involves replacing the rear air/fuel ratio sensor Bank 1 Sensor 1 and addressing any wiring or exhaust leaks that may be contributing to the issue.

7. Is it possible to reset OBDII code P2237 in a Honda without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is important to address the root cause of the problem to prevent the code from reappearing.

8. Are there any maintenance tips to prevent OBDII code P2237 in a Honda?

- Regularly inspecting and maintaining your vehicle's sensors, wiring, and exhaust system can help prevent issues that may trigger OBDII code P2237.

9. Can a DIY enthusiast fix OBDII code P2237 in a Honda, or is professional help recommended?

- Depending on your skill level and access to tools, you may be able to replace the rear air/fuel ratio sensor Bank 1 Sensor 1 yourself. However, professional help is recommended if you are unsure or inexperienced.

10. Will OBDII code P2237 cause any long-term damage to my Honda if left unresolved?

- Ignoring OBDII code P2237 can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time, so it is best to address the issue promptly.

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