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