The Quick Answer above is the generic definition. What follows is the model-specific detail for the BMW models that log P0457.
DTC/P0457·BMW
P0457 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)BMW
P0457 on a BMW 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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BMW 3 Series
2005-2024The 3 Series uses a screw-type fuel cap that clicks when properly tightened, so a cap not turned to the click, or a hardened cap seal, is the first thing to check for P0457. If a new cap does not cure it, check the filler neck seal and the rest of the EVAP system with a smoke test.
What causes P0457 on a BMW?
Beyond the generic causes listed on the main P0457 page, these are the patterns noted for BMW models:
BMW 3 SeriesCap not tightened to the click, or a worn cap seal
BMW 3 SeriesDamaged filler neck seal
How to diagnose P0457 on a BMW 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 BMW? (EUR)
Estimated repair costs for P0457 in EUR, compiled across makes. Expect BMW parts and labour towards the upper 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:
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See the main P0457 guideSkanyx · BMW
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