P0456 MAZDA EVAP Emission System Leak Detected Very Small Leak

Possible causes

– Missing or loose fuel cap
– Incorrect fuel filler cap used
– Fuel filler cap remains open or fails to close
– Foreign matter caught in fuel filler cap
– Evaporative Emission (EVAP) canister or fuel tank leaks
– Evaporative Emission (EVAP) system hose leaking
– Fuel tank leaking

When is the obd code mean?

Evaporative Emission (EVAP) control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Possible a noticeable fuel odor caused by the release of fuel vapors

P0456 MAZDA OBD Code Description