P0455 check engine light code.... please help
 

My check engine light came on yet again and this time the code is p0455. Which after research they sqy the common issue is the gas cap. So I bought a new one and the code came back. No clue where to start now, but as I was getting gas the other day I noticed that the metal thing that swings open when the pump goes in is missing. So I wonder could that be why the code is on and if so can that piece be replaced easily? Ive attached a photo of the metal thing since I have no idea what its called 😊

you mean the flap the get pushed away with the nozzle?

The P0455 indicates a "large EVAP leak". It would be a good idea to inspect all the EVAP lines and canister and so on. I am thinking that the missing flap should not cause a leak itself because the seal is provided by the gas cap. But I could be wrong. The flap's job is to minimize evaporation when you pull off the gas cap for fueling.

A proper leak test will find the problem quickly.

Yes, the flap that is pushed away with the nozzle. Does it have a part name?

How would you do a leak test? Is there any special kinds of tools needed for this?
Thanks for the help.

There are some Youtube videos on how to do a test. I would start with a visual inspection.
I don't know if that flap has a special name.

Check out this link:


Mazda Protege Workshop Manuals


Look at the table of contents, in particular Section 01-16 Emissions. Click on 01-16 and it takes you to a pdf explaining the EVAP system