P0457
Low SeverityEVAP System Leak Detected (Fuel Cap Loose/Off)
EVAP System
What Does P0457 Mean?
Specifically triggered by a loose or missing fuel cap. Some vehicles have a dedicated sensor for this.
Common Fix
Tighten or replace gas cap
Estimated Cost (DIY)
$5 - $15
Symptoms
- ⚠️Check engine light
- ⚠️Gas cap warning message on some vehicles
Common Causes
Loose gas caplikely
Damaged gas cap seallikely
Missing gas cappossible
How to Diagnose P0457
- 1Remove and reinstall gas cap until it clicks
- 2Inspect cap seal for cracks
- 3Replace cap if seal is damaged
Need to read or clear this code?
Shop OBD2 Scanners on Amazon →Frequently Asked Questions
- Will a gas cap fix P0457?
- Almost always yes — P0457 is specifically the gas cap code on many vehicles.
- How much is a replacement gas cap?
- OEM gas caps are $10-$25. Aftermarket caps are $5-$15 but make sure they have the right seal for your vehicle.