What does fault code P0457 mean?

EVAP System Leak Detected (Fuel Cap Loose or Off). The most common EVAP code — system detected a large leak, usually from the fuel cap.

P0457

EVAP System Leak Detected (Fuel Cap Loose or Off)

Q: What are the possible causes of P0457?

Loose, missing, or worn fuel cap seal; Cracked filler neck

Q: How to fix P0457?

Tighten or replace fuel cap; Inspect filler neck seal; Clear code and monitor

Severity: Low Emission Control Generic OBD-II Code Est. Repair: $15 - $40 (fuel cap)

Usually safe to drive short-term, but diagnose soon.

Quick Answer

P0457 means “EVAP System Leak Detected (Fuel Cap Loose or Off).” Severity: Low. Estimated repair cost: $15 - $40 (fuel cap). Most common sign: CEL only, no drivability impact.

What Does P0457 Mean?

The most common EVAP code — system detected a large leak, usually from the fuel cap.

Common Symptoms

CEL only, no drivability impact

Possible Causes

Loose, missing, or worn fuel cap seal

Cracked filler neck

How to Fix P0457 – Repair Guide

Tighten or replace fuel cap

Inspect filler neck seal

Clear code and monitor

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Budgeting for This Repair?

A typical P0457 repair runs about $15 - $40 (fuel cap). If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.