Mitsubishi Automotive Error Code P0455: How to Fix It

Q: Can I drive my Mitsubishi with a P0455 code?

Yes, you can typically drive with a P0455 code as it's not an immediate safety concern. However, you may fail emissions testing and experience slightly reduced fuel economy. It's best to address the issue promptly.

Q: How much does it cost to fix a P0455 code?

Repair costs vary widely depending on the cause. A new gas cap costs $15-30, vacuum hoses cost $10-25, while a purge valve replacement can cost $75-150 including labor. Charcoal canister replacement is more expensive at $200-400.

Q: Will a P0455 code clear itself?

The P0455 code may temporarily clear if the leak is intermittent, but it will likely return. The underlying problem must be fixed for the code to stay cleared permanently.

Q: What's the difference between P0455 and P0456 codes?

P0455 indicates a large EVAP system leak, while P0456 indicates a small leak. P0455 typically involves more obvious issues like loose gas caps or cracked hoses, while P0456 may require more detailed diagnosis.

Q: Can a bad gas cap really cause P0455?

Yes, a loose, damaged, or missing gas cap is one of the most common causes of P0455. The gas cap seals the fuel system and any compromise in this seal can trigger the large leak detection.

Abstract

The P0455 error code in your Mitsubishi indicates a large leak detected in the EVAP (Evaporative Emission Control) system. This system prevents fuel vapors from escaping into the atmosphere and a large leak can affect emissions compliance and fuel economy.