P0456Mini CountrymanYears: 1996 - 2026
Evaporative Emission Control System Leak Detected (Very Small Leak)
Reviewed by ASE Certified Technician
What does this mean?
Code P0456 indicates the PCM has detected a very small leak in the EVAP system, often caused by a slightly worn gas cap seal.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Mini Countryman models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Loose, damaged, or missing gas cap
Cracked or disconnected EVAP hose
Faulty EVAP purge control valve
Faulty EVAP vent valve/solenoid
Symptoms to Watch For
- Check Engine Light is illuminated
- Failed emissions test