P0456 TOYOTA EVAP Control 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
Tech description
There are factory service bulletin for the following Toyota models:

2003