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P0457 EVAP System Leak Detected (Fuel Cap Loose/Off)

What it means

The computer specifically thinks the gas cap is loose or missing.

Severity: Low

Can I drive it? Safe to drive.

Common causes (most likely first)

Loose or missing gas cap
Worn gas cap seal
Damaged filler neck

Likely fixes

Tighten the cap until it clicks
Replace gas cap
Clear code and drive a few days to confirm

DIY parts cost

$10–$40

Approximate estimate

Shop repair cost

$50–$150

Approximate estimate, parts + labor

DIY difficulty

Easy

Varies by vehicle

Cost ranges are rough, approximate U.S. estimates and vary widely by vehicle, region, and parts brand. Always confirm the diagnosis before buying parts.

Parts you may need

Gas capCheck price

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