Engine-Codes.com
Engine-Codes – Lexus – P1423 Lexus

P1423 Lexus Code - Fuel Tank Gross Leak

Quick Answer

The P1423 diagnostic trouble code for Lexus vehicles indicates a fuel tank gross leak. Common causes include Loose or damaged fuel cap, Cracked or damaged fuel tank, Corrosion in the fuel tank system. 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
P1423 Lexus indicates Fuel Tank Gross Leak.
Common causes
Common causes include Loose or damaged fuel cap, Cracked or damaged fuel tank, Corrosion in the fuel tank system.
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 06, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1423 Lexus Description

The P1423 diagnostic trouble code for Lexus vehicles indicates a fuel tank gross leak. This means that there is a significant leak in the fuel tank system that is allowing fuel vapors to escape into the atmosphere, resulting in a loss of fuel efficiency and potentially harmful emissions. The fuel tank system is a crucial component of the vehicle's emissions control system, responsible for storing and delivering fuel to the engine while also preventing fuel vapors from escaping into the environment. A gross leak in the fuel tank system can lead to a variety of performance issues and may also cause the vehicle to fail emissions tests.

OBDII Code P1423 Lexus - Fuel Tank Gross Leak
P1423 Lexus Code - Fuel Tank Gross Leak

Common Causes of P1423 Lexus

  1. Loose or damaged fuel cap
  2. Cracked or damaged fuel tank
  3. Corrosion in the fuel tank system
  4. Faulty fuel tank pressure sensor
  5. Leaking fuel lines or connections

Symptoms of P1423 Lexus

  1. Strong fuel smell inside and outside the vehicle
  2. Decreased fuel efficiency
  3. Check engine light illuminated on the dashboard
  4. Hissing or hissing sound coming from the fuel tank area
  5. Difficulty starting the vehicle

How to Fix P1423 Lexus

  1. Inspect the fuel cap and replace if damaged or not sealing properly
  2. Perform a smoke test to locate the source of the leak in the fuel tank system
  3. Replace any damaged components such as the fuel tank, fuel lines, or connections
  4. Reset the trouble code using an OBD-II scanner
  5. Test drive the vehicle to ensure the issue has been resolved and the check engine light does not reappear

Cost to Fix P1423 Lexus

The cost of repairing a fuel tank gross leak can vary depending on the specific components that need to be replaced and the labor rates at the auto repair shop. On average, the repair costs for this issue can range from $200 to $800, including parts and labor. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's recommended to get a detailed estimate from a trusted mechanic before proceeding with the repair.

Need more information about the P1423 Lexus code?

Need more information on how to fix the P1423 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1423 Lexus code diagnosed by a professional: Find a repair shop in your area

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 P1423 Lexus Code

1. What are the common symptoms of OBDII code P1423 in a Lexus related to a fuel tank gross leak?

The common symptoms include the smell of fuel outside the vehicle, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1423 in a Lexus indicating a fuel tank gross leak?

The code can be triggered by a loose or damaged fuel cap, a cracked or damaged fuel filler neck, or a leak in the fuel tank itself.

3. How can I diagnose the source of a fuel tank gross leak causing OBDII code P1423 in my Lexus?

You can perform a visual inspection of the fuel cap, filler neck, and fuel tank for any signs of damage or leaks. A smoke test can also help locate the source of the leak more precisely.

4. Can a loose fuel cap trigger OBDII code P1423 in a Lexus?

Yes, a loose fuel cap is a common cause of this code. Make sure to tighten the fuel cap properly, clear the code, and see if it returns after a few driving cycles.

5. Is it safe to continue driving my Lexus with OBDII code P1423 related to a fuel tank gross leak?

It is not recommended to drive the vehicle with this code present, as it can lead to fuel leaks and potential safety hazards. It's best to address the issue promptly.

6. Can a DIY repair fix OBDII code P1423 indicating a fuel tank gross leak in a Lexus?

Simple fixes like tightening or replacing the fuel cap can be done as a DIY repair. However, more complex issues with the fuel filler neck or tank may require professional assistance.

7. How much does it typically cost to repair OBDII code P1423 in a Lexus due to a fuel tank gross leak?

The cost of repair can vary depending on the exact cause of the leak. Repairs for issues like a damaged fuel cap or filler neck may range from $50 to $200, while fixing a fuel tank leak can be more expensive.

8. Will resetting the check engine light clear OBDII code P1423 in a Lexus related to a fuel tank gross leak?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the fuel tank gross leak is not addressed, the code is likely to return.

9. How urgent is it to address OBDII code P1423 in a Lexus indicating a fuel tank gross leak?

It is important to address this code promptly to prevent fuel leaks, potential fire hazards, and ensure the proper functioning of the vehicle's emissions system.

10. Can a fuel additive help fix OBDII code P1423 related to a fuel tank gross leak in a Lexus?

Fuel additives are unlikely to fix the underlying issue causing the code. It's best to diagnose the source of the leak and perform the necessary repairs to resolve the problem effectively.

Discuss the causes and fixes for P1423 Lexus OBDII Code

Submit a New Comment

  • I filled up my Lexus RX450h gas tank and parked it for a month. When I started it, the check engine light was on. I discovered I had not properly closed the fuel cap. I closed the fuel cap and drove my car for a week. The check engine light would not reset itself. I connected an OBD2 tester and it displayed the code P1423. I erased the code and all is fine. Why would the check engine light not reset on its own after I fixed the problem days earlier?

    Reply to Comment

    • The P1423 - Fuel Tank Gross Leak code on your Lexus RX450h indicates that the system detected a large leak in the evaporative emission (EVAP) system, which can happen if the fuel cap is not properly closed. While you've since fixed the issue by tightening the fuel cap, the reason the check engine light (CEL) didn’t reset on its own is due to how the EVAP system self-tests and clears codes.

      Why the Check Engine Light Didn't Reset:

      1. Drive Cycles:

        • The EVAP system performs diagnostic checks only under specific conditions (e.g., when the engine is fully warmed up, fuel level is between 15% and 85%, and you're driving at a steady speed).
        • It may take several drive cycles (usually 3-5) that meet these conditions for the ECM to confirm that the issue has been resolved and automatically clear the code.

      2. Persistent Diagnostic Readiness Tests:

        • Even though you've fixed the cause of the code, the system will continue to monitor the EVAP system for any further issues. Until the test completes successfully multiple times, the CEL may remain on.

      3. Manual Clearing vs. Automatic Clearing:

        • Manually clearing the code with an OBD2 scanner erases the error immediately but also resets all readiness monitors.
        • If you had not erased the code, the system would eventually clear the CEL on its own after confirming that the EVAP system passed multiple diagnostic checks.

      Preventive Tips:

      • Always ensure the fuel cap clicks into place after refueling to avoid triggering EVAP system-related codes.
      • If a similar issue occurs in the future, you can continue driving and allow the ECM to complete its diagnostic tests, which should eventually clear the CEL without manual intervention.

      It sounds like your issue is fully resolved now that you've cleared the code manually. Let us know if you have any further questions!

      Reply to Comment