The Quick Answer above is the generic definition. What follows is the model-specific detail for the Ford models that log P0457.
DTC/P0457·Ford
P0457 on Ford: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Ford
P0457 on a Ford means the ECU detected an evaporative system leak consistent with a loose, missing, or damaged fuel cap. The code is specifically tuned to flag cap-sized leaks before flagging generic small (P0442) or large (P0455) leaks. The first thing to check is always the cap itself.
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Ford Focus
2005-2024Ford Focus Mk2 uses a standard screw-type cap with a tether. Mk3 introduced the Easy Fuel capless system on many European trims, eliminating the cap entirely. On capless models, P0457 typically traces to debris stuck in the flapper or a damaged flapper spring. Cleaning often resolves it.
What causes P0457 on a Ford?
Beyond the generic causes listed on the main P0457 page, these are the patterns noted for Ford models:
Ford FocusWorn screw-cap seal on Mk2
Ford FocusDebris in Easy Fuel flapper assembly on Mk3 capless models
How to diagnose P0457 on a Ford with OBD2
Follow these steps to pinpoint the root cause of P0457:
- Remove the fuel cap and inspect the rubber seal for cracks, brittleness, or debris. If the seal compresses unevenly when squeezed, replace the cap
- Re-seat the cap and tighten until it clicks. Clear the code and drive for 3 to 5 cycles to let the EVAP monitor retest
- If the code returns with a known good cap, inspect the fuel filler neck. Look for damage to the threads or to the sealing surface where the cap meets the neck
- On capless filler systems (such as Ford Easy Fuel), inspect the flapper assembly for debris, damaged seals, or a stuck flapper. Clean carefully or replace the assembly if damaged
- If the cap and filler neck are good, perform a smoke test focusing on the upper portion of the EVAP system. A leak at the tank top or fuel pump module gasket can mimic a cap leak
How much does P0457 cost to fix on a Ford? (EUR)
Estimated repair costs for P0457 in EUR, compiled across makes. Ford parts and labour usually land towards the lower end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0457
These codes are often seen alongside P0457 or point to related issues, on any make:
Looking for the full P0457 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0457 guideSkanyx · Ford
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