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P1172 2010 Honda Accord Code - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

Quick Answer

The P1172 diagnostic trouble code (DTC) for a 2010 Honda Accord indicates that the Rear Air/Fuel (A/F) Sensor Bank 1 Sensor 1 Circuit is Out Of Range High. Common causes include Faulty rear A/F sensor, Wiring or connector issues, Exhaust leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1172 2010 Honda Accord indicates Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High.
Common causes
Common causes include Faulty rear A/F sensor, Wiring or connector issues, Exhaust leaks.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P1172 2010 Honda Accord Description

The P1172 diagnostic trouble code (DTC) for a 2010 Honda Accord indicates that the Rear Air/Fuel (A/F) Sensor Bank 1 Sensor 1 Circuit is Out Of Range High. This means that the signal from the rear A/F sensor located in Bank 1 (cylinder bank 1) is registering a voltage that is higher than the expected range. The rear A/F sensor is responsible for monitoring the air-fuel mixture in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the fuel injection for optimal combustion.

OBDII Code P1172 2010 Honda Accord - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High
P1172 2010 Honda Accord Code - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

Common Causes of P1172 2010 Honda Accord

  1. Faulty rear A/F sensor
  2. Wiring or connector issues
  3. Exhaust leaks
  4. ECM malfunction
  5. Fuel system problems

Symptoms of P1172 2010 Honda Accord

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

How to Fix P1172 2010 Honda Accord

  1. Begin by connecting a diagnostic scan tool to the vehicle's OBD-II port to retrieve the trouble codes and confirm the issue.
  2. Inspect the rear A/F sensor, wiring, and connectors for any visible damage or corrosion. Replace any damaged components.
  3. Perform a voltage test on the rear A/F sensor to verify if it is operating within the specified range. Replace the sensor if necessary.
  4. Clear the trouble codes from the ECM's memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint the exact cause, such as checking for exhaust leaks or testing the ECM.

Cost to Fix P1172 2010 Honda Accord

The typical repair costs for addressing a P1172 code on a 2010 Honda Accord can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor in your area. This estimate includes the cost of a new rear A/F sensor, wiring repairs, and diagnostic labor. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple shops to ensure a competitive price. Additionally, the cost may be higher if additional repairs or parts replacement are needed.

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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 P1172 2010 Honda Accord Code

1. What are the common symptoms of OBDII code P1172 in a 2010 Honda Accord related to the Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

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

2. What could cause the OBDII code P1172 in a 2010 Honda Accord indicating Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- Possible causes include a faulty rear air/fuel ratio sensor, issues with the sensor circuit wiring, exhaust leaks, or problems with the engine's air-fuel mixture.

3. How can I diagnose the root cause of OBDII code P1172 on my 2010 Honda Accord for the Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- Diagnose the issue by inspecting the rear A/F sensor for damage, checking the sensor's wiring and connections, scanning for exhaust leaks, and ensuring proper air-fuel mixture.

4. Can a dirty or contaminated rear A/F sensor trigger the OBDII code P1172 in a 2010 Honda Accord for Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- Yes, a dirty or contaminated sensor can cause inaccurate readings and trigger the code. Cleaning or replacing the sensor may resolve the issue.

5. Are there any DIY repair tips for addressing the OBDII code P1172 on a 2010 Honda Accord related to Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- DIY repair tips include checking and cleaning sensor connections, inspecting wiring for damage, ensuring proper sensor installation, and addressing any exhaust leaks.

6. Is it safe to continue driving a 2010 Honda Accord with the OBDII code P1172 indicating Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- It is not recommended to drive the vehicle for an extended period with this issue, as it can lead to decreased fuel efficiency, engine performance problems, and potential damage if left unresolved.

7. Will resetting the OBDII code P1172 in a 2010 Honda Accord for the Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High make the problem disappear?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the fault code is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair the OBDII code P1172 on a 2010 Honda Accord related to Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- Repair costs can vary depending on the exact cause of the issue. Costs may range from a few hundred dollars for sensor replacement to more significant amounts if wiring or exhaust repairs are needed.

9. Can a mechanic use a scan tool to troubleshoot the OBDII code P1172 in a 2010 Honda Accord for Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- Yes, a mechanic can use a scan tool to read the code, monitor sensor data, and perform diagnostic tests to pinpoint the exact cause of the problem.

10. How long does it take to repair the OBDII code P1172 on a 2010 Honda Accord related to Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High?

- Repair times can vary based on the specific issue but generally range from 1-3 hours for sensor replacement or wiring repairs. More complex issues may take longer to resolve.

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