Acura Error Code P0455: How to Fix It

Medium 1-2 hours Low Severity Verified June 2026
Error Code
P0455
Brand
Acura
Product Type
automotive
Severity
Low
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
The P0455 error code in your Acura indicates a large leak has been detected in the Evaporative Emission Control (EVAP) system. This system prevents fuel vapors from escaping into the atmosphere, and while this error won't immediately damage your engine, it can cause your vehicle to fail emissions testing and may trigger the check engine light.
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Tools You'll Need

How to Fix Error Code P0455

  1. Connect OBD2 scanner and verify the code

    Ensure the vehicle is parked on level ground and the engine is cool before beginning diagnosis.
  2. Visually inspect the gas cap

  3. Check EVAP system vacuum hoses

    Do not smoke or use open flames when inspecting fuel system components.
  4. Inspect the charcoal canister

    Use jack stands if you need to raise the vehicle. Never rely solely on a jack for support.
  5. Test the purge valve

  6. Clear codes and test drive

Parts You May Need

EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
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EVAP charcoal canister
Check Price on Amazon
EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
Check Price on Amazon
EVAP charcoal canister
Check Price on Amazon
EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
Check Price on Amazon
EVAP charcoal canister
Check Price on Amazon
EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
Check Price on Amazon
EVAP charcoal canister
Check Price on Amazon
EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
Check Price on Amazon
EVAP charcoal canister
Check Price on Amazon
EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
Check Price on Amazon
EVAP charcoal canister
Check Price on Amazon
EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
Check Price on Amazon
EVAP charcoal canister
Check Price on Amazon
EVAP vacuum hoses
Check Price on Amazon
EVAP purge valve
Check Price on Amazon
EVAP charcoal canister
Check Price on Amazon
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When to Call a Professional

Contact a certified mechanic if you cannot locate the leak after following these steps, if the leak is in the fuel tank itself, or if you're not comfortable working around fuel system components. Professional smoke testing equipment may be needed to find small leaks.

Frequently Asked Questions

Can I drive my Acura with P0455 error code?
Yes, you can continue driving with P0455 as it doesn't pose immediate safety risks. However, your vehicle may fail emissions testing and fuel economy may be slightly reduced. Address the issue promptly to prevent potential damage to other EVAP components.
How much does it cost to fix P0455 in an Acura?
Repair costs vary widely depending on the cause. A loose or damaged gas cap costs $10-30 to replace. EVAP hoses cost $20-50. A faulty purge valve ranges from $80-200 including labor. More complex issues like charcoal canister replacement can cost $200-500.
Will P0455 cause my Acura to fail inspection?
Yes, P0455 will typically cause your vehicle to fail emissions testing in states that require it. The error must be resolved and the check engine light turned off before passing inspection.
How often should I replace my Acura's gas cap?
Gas caps typically last 5-7 years under normal conditions. Replace it if you notice cracks in the rubber seal, the cap doesn't click when tightened, or if it's damaged. A quality replacement cap costs $15-30.