You find and repair the leak in the evaporative fuel system. It could be anywhere between the gas cap and the engine. Check all vacuum hoses and lines for cracks or holes.
Most probable cause: Replace Gas Cap Most probable cause: Replace Gas Cap
Try the gas cap... Look for any cracked hoses between the fuel tank and engine.
DTC P0455: Evaporative Emission (EVAP) System Large Leak
Trouble code P0455 means: EVAP System Gross Leak (0.080") Detected
Trouble code P0455 means: EVAP System Large Leak (0.080") Detected
P0455 requires two failures in a row to turn the light on. Pending means that it has failed the large leak test once. Treat it like an active code. P0455 evaporative emissions large leak.
Trouble code P0455 means: Evaporative Emission System Leak Detected (gross leak/no flow)
A good place to start would be the fuel cap, it may be faulty or just not on tight.
Code P0455 means "Evaporative Emission System Leak Detected (gross leak/no flow)"
With a p0455, the most common repair is to:Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.Otherwise, replace the gas cap, and/orInspect the EVAP system for cuts/holes in tubes/hoses that run from the fuel tank to the engine (you may hear a vacuum noise or smell fuel), repair if necessary
P0455 - Evap Emission Control System Leak Detected ( no purge flow or large leak )
Trouble code P0455 means:EVAP Large Leak DetectedLarge vapor leak in the evaporative emmisions systemTrouble code P0455 means: Evaporative Emission System Leak Detected (gross leak/no flow)Large vapor leak in the evaporative emmisions system