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2020 Mirage G4 - EVAP System Code P0441 and P0455

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Laura J. · rep 0 · May 22, 5:29 AM · 1 replies · solved · Question

Vehicle: 2020 Mitsubishi Mirage G4 ES

Hi everyone,

I'm having some trouble with my 2020 Mitsubishi Mirage G4, 1.2L. The Check Engine Light came on a few days ago, and it's been on ever since. I used my scanner and pulled two codes: P0441 (EVAP System Incorrect Purge Flow) and P0455 (EVAP System Leak Detected - Large Leak).

The car seems to be running fine, no noticeable performance issues or strange noises. I just filled up the gas tank recently, so I made sure the gas cap was tightened properly, but the light is still on. I'm worried about failing emissions if I don't get this fixed.

What are the most common culprits for these EVAP codes on a Mirage G4? Any tips on where to look first?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:29 AM

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ClearTheCode admin answer:

EVAP system codes P0441 and P0455 often point to issues with the evaporative emissions control system, which prevents fuel vapors from escaping into the atmosphere. While your car might run fine, these issues can lead to increased emissions and will cause you to fail an inspection.

Here's a breakdown of common causes and diagnostic steps:

  1. Check the Gas Cap:

    • Action: Even though you've checked it, ensure the gas cap is the correct one for your vehicle and is sealing properly. Sometimes, the rubber seal on the cap can degrade over time. Try replacing it with a new, OEM-quality gas cap.
    • Causes: Loose, damaged, or incorrect gas cap.

  2. Inspect EVAP Hoses and Lines:

    • Action: Visually inspect all accessible vacuum and EVAP hoses running from the fuel tank to the engine bay. Look for cracks, disconnections, or signs of rodent damage. Pay close attention to the lines connected to the purge valve and canister.
    • Causes: Cracked, disconnected, or damaged EVAP hoses/lines.

  3. Test the Purge Valve (Canister Purge Solenoid):

    • Action: The purge valve controls the flow of fuel vapors from the charcoal canister to the engine. A faulty purge valve can cause both incorrect flow (P0441) and contribute to a large leak (P0455) if it's stuck open. You can often locate it near the intake manifold. With the engine off, it should be closed. You can test its operation with a vacuum pump or by applying 12V to see if it clicks open and closed.
    • Causes: Stuck open, stuck closed, or electrically faulty purge valve.

  4. Inspect the Vent Valve (Canister Vent Solenoid):

    • Action: The vent valve, usually located near the charcoal canister (often near the fuel tank), controls the air intake into the EVAP system. If it's stuck open, it can cause a large leak (P0455). If it's stuck closed, it can cause other issues. Check for proper operation and ensure its filter isn't clogged.
    • Causes: Stuck open, stuck closed, or electrically faulty vent valve.

  5. Check the Charcoal Canister:

    • Action: While less common, the charcoal canister itself can sometimes be damaged or saturated, leading to EVAP issues. Inspect it for cracks or physical damage.
    • Causes: Damaged or saturated charcoal canister.

When to See a Shop: If replacing the gas cap and a thorough visual inspection of hoses doesn't resolve the issue, or if you're not comfortable testing the purge and vent valves, it's advisable to take your Mirage G4 to a professional. EVAP system diagnostics can be complex, often requiring a smoke machine to pinpoint leaks accurately. A qualified technician can quickly identify the source of the leak or component failure and ensure your vehicle passes emissions.

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