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Code

P0457

Evaporative emissions

EVAP leak detected — fuel cap loose

A fuel cap leak is detected in the EVAP system.

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Most likely causes

Fuel cap loose or missing
Damaged cap seal
Vent issue

Symptoms you may notice

Check engine light

Checks to run

Tighten the fuel cap
Inspect the seal
Clear and retest

Tools you may need

OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Evaporative emissions

Small leak in EVAP system

EVAP vent valve control circuit malfunction

Large leak in EVAP system

Very small leak in EVAP system

EVAP pressure sensor high input

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