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p0456
Easy Fix
BMW · Sedans
EVAP Emission System Leak Detected (Very Small Leak)
Quick Answer
Error code P0456 on your BMW Sedans means: EVAP Emission System Leak Detected (Very Small Leak). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
330i530i540i740i760i330e 2024330i xDrive 2024530i 2024530i xDrive 2024540i xDrive 2024545e xDrive 2024740i 2024740i xDrive 2024760i xDrive 2024M3 CS 2024M3 Competition 2024M3 Competition xDrive 2024M340i xDrive 2024i4 M50 2024i4 eDrive35 2024i4 eDrive40 2024M3M340ii4i5
Likely Causes
  1. Loose or damaged fuel cap
  2. Cracked EVAP canister or hoses
  3. Faulty purge valve or vent valve
  4. Small crack in fuel tank or filler neck
  5. Deteriorated EVAP system O-rings or seals
How to Fix It
1
Inspect fuel cap for cracks or a damaged seal and tighten or replace
2
Perform an EVAP smoke test to locate the leak source
3
Inspect all EVAP hoses and connections for cracks or loose fittings
4
Test purge valve and vent valve operation with a scan tool
5
Clear codes and drive for two complete drive cycles to verify repair
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Fuel cap
EVAP purge valve
EVAP vent valve
EVAP hoses
Related Error Codes
P0171P0174P0300P0335P0340
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