P0457Low SeverityEmissions

Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)

What This Means

The EVAP system has detected a leak consistent with a loose or missing fuel cap. This is the most common and easiest-to-fix EVAP system issue.

Common Symptoms

Check engine light on
Possible fuel smell
No driveability issues
Failed emissions test

Common Causes

Loose or damaged gas cap
Cracked EVAP hose
Faulty purge/vent valve
Charcoal canister issue
Fuel tank pressure sensor failure

Estimated Repair Cost

$50 – $400

Parts and labor (varies by vehicle and location)

Difficulty:Moderate

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.