My CEL is on so I stop at autozone to check it out the code is: P0455

Definition
EVAP large leak detected

Explanation
The ECM has detected a large leak in the EVAP system during a system monitor test

Probable causes
1. Defective, loose or missing fuel cap
2. EVAP canister broke, hose cracked or not connected
3. Purge or vent solenoid defective
4. Vacuum leak at engin

Thats what autozone receipt said

So I check the fuel cup its ok and under the car I didnt see any leaks but its dark outside I will have to check one more time tomorrow morning

What is EVAP??? where to take a look for it

Any suggestion about number 3 and 4???????
Thanks

 

Need to know if there was any recent work done and the type of mods you have.

What codes are you getting. I have a svc manual on disk...want to look them up.

 

EVAP (evaporative emissions)

 

NO mods last sunday i just do the foot lights the engine is oem I didnt do anything in the engine area only oil check and add some last week but i dont think so I can mess up with some hoses

The only code I have from autozone is P0455

 

How do you know the gas cap is fine?? P0455 is almost always a gas cap issue and you cannot tell by looking at it or putting it on. You can buy a new cap for under $15.00 or spend a few hours letting the dealer fix it if still under warranty.

 

evaporative emissions hmmmm dosnt explain it to me much english is my 2nd language where the canister is located ??? so maybe I could chack it out tomorrow if its leaking or something is wrong with it. I was using flashlight to take a look at the engine right now but everything looks fine avery hose looks clean and dry maybe one place where is logo 13B mazda and the dip stick is on the black plastick is like a lil dirt mix with oil (grease) but its looks normal not like it start leak from last week

 

When I said the gas cap is fine I maen that I make sure they closed it good on gas station I didnt think it could be broke by other ways so you maen that maybe the rubber seal is broke ??? I will take a look tomorrow or buy a new gas cap

Thanks guys

 

my bad. i dont know much on this subject. just wanted to help as much as i could

 

Thanks chetrickerman

 

When I had the P0455 issue the cap screwed on fine. I reset the CEL and it came back again. I bought a new cap and the cel went away. Half of the EVAP system is by the fuel tank, the labor involved in working on that is high. Get a new gas cap, it should solve the problem.

 

Thanks expo I will buy it tomorrow and yes the car is under warranty 100.000 and 5 years bought it new almost 2 years ago but I dont have time for appointments in Wayne Mazda I need a car to go to work and dont want to spent half a day at the dealer thinking if the technician will solve a problem or not

 

and one more thing when I first reset the computer by taking of a minus clamp after I start the car and turn the wheels to the right and to the left I still have to put my feet on acceleration pedal bicouse the car could not have a low rpms Is It normal ????? after let say 20 sec it got it and idle a lil under 1k rpm like always
But if the car wasnt run earlier and get warmed up I would probably get it flodded first time hmmm It was bicouse computer need a time to figure out about an amount of fuel the car need?????

 

Ok so after two weeks I changedthe fuel cup cel go away
Thanks to EXPO1 u were right about it !!