P0457 (generic)
EVAP Leak Detected (Fuel Cap Loose/Off)
System: Powertrain · EVAP
Severity: minor · Inspection: often fails
Description
Loose or missing fuel cap detected. Tighten or replace the cap. Code should clear after a few drive cycles.
Diagnostic snapshot P0457
- Difficulty
- 6/10 — Intermediate diagnostics
- Est. repair cost
- $120 – $450 (parts + typical shop labor)
Diagnostic workflow
- Confirm P0457 with a live scan — note pending vs stored and freeze frame data.
- Inspect wiring/connectors and related sensors before replacing modules.
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
None linked yet.
Common fixes (curated)
None linked yet.
Related articles
- Check Engine Light from Loose Gas Cap 2018 Toyota Prius
- Check Engine Light Due to Loose Gas Cap 2017 Toyota Sienna
- Check Engine Light from Loose Gas Cap 2018 Toyota 86
- Gas Cap Light On Dashboard 2020 Toyota Prius Prime
- Gas Cap Light On Dashboard 2020 Toyota Highlander Fix
- Gas Cap Not Sealing Properly Check Engine Light 2020 Toyota Tundra
- Gas Cap Light On Dashboard 2018 Toyota Land Cruiser
- Check Engine Light: Loose Gas Cap on 1996 Ford E-350
- Gas Cap Not Sealing Properly: 1999 Ford E-450 Check Engine Light
- Check Engine Light due to Loose Gas Cap 2002 Toyota 4Runner
- Gas Cap Check Engine Light 1996 Ford A9513 Fix
Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).