P1457 Honda Code: Diagnosing And Resolving EVAP Problems

Dealing with a specific trouble code like P1457 in your Honda vehicle can be frustrating, but with the right knowledge and guidance, you can diagnose and fix the issue. In this article, I will show you the common causes of the P1457 code and provide you with a step-by-step procedure to troubleshoot and repair it. 

I’ll give you guidance on essential tools and parts required, as well as the level of DIY repair involved. Whether you’re a seasoned DIY enthusiast or looking to understand the problem before seeking professional help, this article will equip you with the necessary information to tackle the P1457 code in your Honda car.

 Let’s dive in!

P1457 Honda Code: A Quick Overview

Take a look at the summary of the Honda P1457 code provided below!

  • Definition:  Evaporative Emission Control System Leak Detected – B
  • Severity: Low
  • DIY Skill Level: Intermediate
  • Continue To Drive?: Yes
  • Estimated Repair Cost: $20 – $500

What Does The P1457 Honda Code Mean?

P1457 is an OBD-II (On-Board Diagnostics) code that refers to an Evaporative Emission Control (EVAP) System Leak Detected – B. It indicates that a leak has been detected in the EVAP system. This system is responsible for preventing the release of fuel vapors into the atmosphere, ensuring compliance with environmental regulations.

While the P1457 code may occur in various Honda models, a few notable ones include the Honda Accord, Civic, CR-V, Odyssey, and Pilot. It is important to note that while P1457 is commonly encountered in Honda vehicles, it is not exclusive to them.

P1457 Honda indicates that a leak has been detected in the EVAP system.
EVAP system diagram in Honda vehicles.
(Credit: honda-tech.com)

In some cases, P1457 could appear along with some additional DTCs (diagnostic trouble codes)that provide further insight into the issue. Some common accompanying codes include P0440, P0441, P0442, and P0497.

How Severe Is The P1457 Code In Your Honda? 

The severity level of the P1457 Honda DTC can be considered relatively low, and you can continue to drive. While this issue may affect the vehicle’s performance and fuel efficiency, it is unlikely to cause immediate or significant safety concerns.

However, it is advisable not to ignore the P1457 code and to address it as soon as possible. It can lead to increased emissions, potential damage to other emission control components, and potential emissions testing failures in the long term.

What Are The Signs Of The P1457 Code On Honda Vehicles?

The P1457 Honda DTC may not present significant noticeable symptoms other than the illumination of the check engine light. However, in the event of a larger leak, you can experience the following signs:

What Are The Causes Of The P1457 Honda Code? 

Determining the root cause of the P1457 Honda DTC is crucial for effective diagnosis and repair. The following are some common causes associated with this code:

  • Loose, damaged, or missing fuel cap
  • Faulty fuel tank pressure sensor
  • Corroded or malfunctioning vent valve
  • Leaks in the EVAP system hoses or components
  • Damaged or deteriorated EVAP canister
  • Faulty purge control solenoid (PCS) valve
  • Issues with the two-way valve or bypass solenoid (BPS) valve

Read more: P145C Honda Code: Expert Tips for Emission System Repairs

How To Diagnose And Fix The P1457 Code On Honda?

In this section, we will discuss the essential tools and parts required, provide a step-by-step procedure to diagnose and fix the P1457 code, and discuss the level of DIY repair and estimated costs.

Essential Tools And Parts

To diagnose and repair the P1457 code successfully, you may need to have the following tools and parts (if required):

Step-by-Step Procedure

1. Retrieve trouble codes

  • Connect the OBD-II scanner to the vehicle’s diagnostic port.
  • Retrieve the trouble codes stored in the vehicle’s computer system.

2. Inspect and replace the fuel cap

  • Inspect the fuel cap and ensure it is tight and in good condition.
  • Replace the fuel cap if it is damaged or missing.

3. Perform the EVAP function test

  • Use the Honda diagnostic tool to perform the EVAP Function Test.
  • Check for any system malfunctions or abnormalities.

4. Check the fuel tank pressure sensor

  • Use the diagnostic tool to check the FTP sensor value.
  • If the FTP sensor value is out of the specified range, replace the FTP sensor.

5. Test for leaks in the canister side

  • Apply vacuum to the system and monitor the FTP sensor value.
  • If a leak is detected, replace the CVS valve.

6. Test the fuel tank vapor control valve

  • Apply vacuum to the system and monitor the FTP sensor value.
  • If a leak is detected, replace the fuel tank vapor control valve.

7. Test the two-way valve and BPS valve

  • Apply vacuum to the system and monitor the FTP sensor value.
  • If any leaks are detected, replace the faulty two-way valve and BPS valve.

8. Inspect EVAP canister and hoses

  • Inspect the EVAP canister and hoses for any signs of leaks or damage.
  • Replace the canister or hoses if leaks are found.

9. Test purge hose

  • Apply vacuum to the system and monitor the FTP sensor value.
  • If a leak is detected, replace the purge hose.

10. Test purge control solenoid valve

  • Use a vacuum gauge to test the PCS valve for leaks.
  • Replace the valve if necessary.

11. Clear trouble codes and verify

  • Clear the trouble codes from the vehicle’s computer system.
  • Drive the vehicle to complete the EVAP system monitor.
  • Verify that the P1457 code does not return.
Watch this video to learn how to diagnose and fix the P1457 code.


  • It is important to consult the vehicle’s service manual for detailed instructions and specifications specific to your Honda model. There is a Technical Service Bulletin (TSB) from Honda related to the P1457 code for your information.
  • In most cases, the main culprits for the P1457 code are indeed the EVAP canister and the CVS valve. Therefore, it is essential to thoroughly inspect the canister and CVS valve for any signs of leaks, damage, or malfunction. If any issues are detected, replace these components.

Read more: Honda OBD2 Codes List [Generic + Manufacturer-specific]

DIY Repair Level And Estimated Costs

This repair procedure involves intermediate-level DIY skills. If you are unsure or uncomfortable performing these tasks, it is recommended to seek assistance from a qualified mechanic or automotive professional.

The estimated costs for the main repair tasks may vary depending on factors such as the specific Honda model and the cost of replacement parts. Here is a general cost breakdown:

Repair TaskEstimated Cost
Fuel tank pressure sensor replacement$50 – $100
Canister vent shut valve replacement$50 – $100
Fuel tank vapor control valve replacement$50 – $100
Two-way valve and BPS valve replacement$100 – $200
EVAP canister and hoses replacement$100 – $300
Purge hose replacement$20 – $50
Purge control solenoid valve replacement$50 – $100

If you’re uncertain about any aspect of the repair process or lack experience, consulting a certified mechanic is a prudent step to ensure an effective and safe resolution of the issue.

Final Thoughts

Facing the P1457 code in your Honda is a common but manageable challenge. Understanding its triggers and taking swift action can ensure your vehicle remains both efficient and environmentally responsible. By diagnosing and addressing issues within the Evaporative Emission Control System (EVAP), you not only restore your vehicle’s performance but also contribute to cleaner air for all.

Have you encountered the P1457 code before, or do you have insights to share? We’d love to hear your experiences and tips. Feel free to comment below and share this valuable information with fellow Honda enthusiasts. 

Together, we can keep our vehicles running smoothly and minimize our impact on the environment. Safe driving!

Reference Sources

  1. National Highway Traffic Safety Administration. (2013). Technical Service Bulletin: SB-10053545-3978 [PDF document]
  2. J.D. Power, What Does It Mean When Your Car Stalls? 
  3. Cars.com. Fuel Tank Pressure Sensor

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