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p0456
Easy Fix
BMW · SUVs
EVAP Emission System Leak Detected (Very Small Leak)
Quick Answer
Error code P0456 on your BMW SUVs 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
X1 M35i 2024X1 xDrive28i 2024X3 M 2024X3 M40i 2024X3 xDrive30i 2024X5 M 2024X5 M60i 2024X5 xDrive40i 2024X5 xDrive50e 2024X6 M 2024X6 M60i 2024X6 xDrive40i 2024X7 M60i 2024X7 xDrive40i 2024iX M60 2024iX xDrive50 2024X1X3 MX3X5 MX5X6X7iX
Likely Causes
  1. Loose or cracked fuel cap
  2. Cracked EVAP canister or hoses
  3. Faulty purge valve or vent valve
  4. Small crack in the fuel tank or filler neck
  5. Deteriorated O-rings in the EVAP system
How to Fix It
1
Inspect the fuel cap seal and tighten or replace
2
Perform an EVAP smoke test to pinpoint the leak location
3
Inspect all EVAP hoses and connections for cracks
4
Test purge valve and vent valve operation using a scan tool
5
Clear codes and complete two drive cycles to verify the 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 and connectors
Related Error Codes
P0171P0174P0300P0301P0335
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