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Engine-Codes – Honda – P1172 2009 Honda Accord

P1172 2009 Honda Accord Code - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

Quick Answer

The P1172 code for a 2009 Honda Accord indicates an issue with the Rear Air/Fuel (A/F) Sensor Bank 1 Sensor 1 Circuit being out of range high. Common causes include Faulty Rear A/F Sensor, Wiring or connector issues, Vacuum leak. 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 2009 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, Vacuum leak.
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 13, 2024
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Code P1172 2009 Honda Accord Description

The P1172 code for a 2009 Honda Accord indicates an issue with the Rear Air/Fuel (A/F) Sensor Bank 1 Sensor 1 Circuit being out of range high. This sensor is responsible for monitoring the air-fuel ratio in the exhaust system and sending this information to the engine control module (ECM) for optimal fuel delivery and emissions control. When the sensor detects that the air-fuel mixture is too rich (too much fuel), it will trigger the P1172 code.

OBDII Code P1172 2009 Honda Accord - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High
P1172 2009 Honda Accord Code - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

Common Causes of P1172 2009 Honda Accord

  1. Faulty Rear A/F Sensor
  2. Wiring or connector issues
  3. Vacuum leak
  4. Fuel pressure problem
  5. ECM malfunction

Symptoms of P1172 2009 Honda Accord

  1. Decreased fuel efficiency
  2. Engine misfires or hesitation
  3. Rough idling or stalling
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P1172 2009 Honda Accord

  1. Begin by diagnosing the issue using a scan tool to confirm the P1172 code and identify the specific problem.
  2. Inspect the wiring and connectors associated with the Rear A/F Sensor for any damage or corrosion. Repair or replace as needed.
  3. Test the Rear A/F Sensor itself to determine if it is functioning properly. Replace if necessary.
  4. Check for any vacuum leaks in the intake system that could be affecting the air-fuel mixture. Repair as needed.
  5. Verify the fuel pressure is within the manufacturer's specifications. Address any issues with the fuel system that could be causing the rich air-fuel mixture.

Cost to Fix P1172 2009 Honda Accord

The typical repair costs for addressing a P1172 code on a 2009 Honda Accord can vary depending on the specific cause of the issue. In general, replacing a faulty Rear A/F Sensor can cost between $150 and $300, including parts and labor. However, if additional repairs or diagnostic work are needed, the total cost could be higher. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates can vary between different locations and types of repair facilities.

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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 2009 Honda Accord Code

1. What are the common symptoms of OBDII code P1172 on a 2009 Honda Accord related to the Rear A/F Sensor Bank 1 Sensor 1 circuit being out of range high?

- Common symptoms include poor fuel economy, rough idling, loss of power, and the illuminated check engine light.

2. What are the possible causes of OBDII code P1172 on a 2009 Honda Accord?

- The code P1172 can be triggered by a faulty rear Air/Fuel (A/F) sensor Bank 1 Sensor 1, wiring issues, or a problem with the engine control module (ECM).

3. How do I diagnose the issue causing OBDII code P1172 on my 2009 Honda Accord?

- Diagnosing the issue involves checking the rear A/F sensor Bank 1 Sensor 1 for proper operation, inspecting the wiring for damage or loose connections, and scanning the ECM for fault codes.

4. Can I continue driving my 2009 Honda Accord with OBDII code P1172 present?

- It is not recommended to drive the vehicle with the code P1172 present, as it can lead to poor engine performance and potentially cause damage to other components.

5. How can I repair OBDII code P1172 on a 2009 Honda Accord related to the Rear A/F Sensor Bank 1 Sensor 1 circuit being out of range high?

- The repair typically involves replacing the rear A/F sensor Bank 1 Sensor 1 if it is found to be faulty, repairing any damaged wiring, and clearing the fault codes.

6. Is it possible to reset the OBDII code P1172 on a 2009 Honda Accord without fixing the issue?

- While you can clear the fault code using a scan tool, the underlying issue causing the code will need to be addressed to prevent it from recurring.

7. How much does it cost to fix OBDII code P1172 on a 2009 Honda Accord at a repair shop?

- The cost of fixing the code P1172 can vary depending on the exact cause of the issue, but it typically involves diagnostic labor charges, parts costs for the sensor or wiring repairs, and any necessary programming.

8. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1172 on a 2009 Honda Accord?

- Depending on the exact cause, a DIY enthusiast may be able to fix the code P1172 by replacing the rear A/F sensor Bank 1 Sensor 1 or addressing any wiring issues with the proper tools and instructions.

9. How long does it take to repair OBDII code P1172 on a 2009 Honda Accord?

- The repair time can vary based on the cause of the issue and the expertise of the technician, but it typically takes a few hours to diagnose and fix the problem.

10. Will fixing OBDII code P1172 on a 2009 Honda Accord improve the vehicle's overall performance?

- Yes, addressing the code P1172 and restoring the proper operation of the rear A/F sensor Bank 1 Sensor 1 can help improve fuel efficiency, engine performance, and overall drivability of the vehicle.

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