P0455 - Not the gas cap

slavrenz

Riddle me that!
:
2001 Mazda Protege LX 2.0
Hey guys,

The CEL came on for me a few weeks ago - P0455. Tried resetting the gas cap, reset the CEL, came back on a few days later. I then tried replacing the gas cap, same procedure, no good.

Anyone have any tips on what emissions parts usually go bad on our cars? I'm looking at the purge solenoid valve, charcoal canister, CDCV, fuel tank, etc. Unfortunately, it seems as if you need the $5k Mazda testing machine for most of these :(
 
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03' Protege5
My car is currently giving me the P0442 error (small EVAP leak), similar issue to yours. Sadly this came up 3 days after i bought the car, private sale.

First a little back story here: Maybe 200miles before I bought the car a fair amount of work was done, including replacing the fuel pump and lines, so i took it to the shop that did the work to say WTF. They came back and said the issue is there is rust on my gas tank around where the fuel pump sits, and because of this the tank is not sealed shut, which is causing this error. The fix for me according to this place, a new gas tank, quoted at $500parts +$250labor. I took the car back and I'm taking it to a shop i know and trust to look at the car before i get anything done.

The test to check for leaks is the smoke test, its a device that attaches to the fuel system and then pressurizes it with smoke, where the smoke comes out is where the leak is.

More likely than having a rusted out gas tank is there is a fuel line or connection thats corroded, however unless you can get under the car and see the leak the smoke test is the only reliable way to go i think. I had called the mazda dealership about the problem I'm having they want about 150 to diagnose the problem, I am also sure most shops have the capability of doing this test for you, probably for less then 150.

With me the only bright side is that the previous owner agreed to pay for half, even though there is no lemon law saying he has to do anything.

Good luck, hopefully its something small.
 
Last edited:

slavrenz

Riddle me that!
:
2001 Mazda Protege LX 2.0
My car is currently giving me the P0442 error (small EVAP leak), similar issue to yours. Sadly this came up 3 days after i bought the car, private sale.

First a little back story here: Maybe 200miles before I bought the car a fair amount of work was done, including replacing the fuel pump and lines, so i took it to the shop that did the work to say WTF. They came back and said the issue is there is rust on my gas tank around where the fuel pump sits, and because of this the tank is not sealed shut, which is causing this error. The fix for me according to this place, a new gas tank, quoted at $500parts +$250labor. I took the car back and I'm taking it to a shop i know and trust to look at the car before i get anything done.

The test to check for leaks is the smoke test, its a device that attaches to the fuel system and then pressurizes it with smoke, where the smoke comes out is where the leak is.

More likely than having a rusted out gas tank is there is a fuel line or connection thats corroded, however unless you can get under the car and see the leak the smoke test is the only reliable way to go i think. I had called the mazda dealership about the problem I'm having they want about 150 to diagnose the problem, I am also sure most shops have the capability of doing this test for you, probably for less then 150.

With me the only bright side is that the previous owner agreed to pay for half, even though there is no lemon law saying he has to do anything.

Good luck, hopefully its something small.
Lol, thank god it was something small. So after inspecting my vacuum lines for the 100th time today, I finally found that the bottom hose coming out of my purge solenoid valve wasn't connected to the throttle body. Hooked 'er back up, and all should be good.
 
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03' Protege5
ohh how I envy you...

my car is on the way to the local shop where i know the guys today. Its sad that I'm hoping that the other shop was jerking me around, but i highly doubt it, they seemed like pretty stand up people and if it was a problem with their work they would have done it for free :(
 
:
impreza
bump I have had this code also I got a new gas cap and it's still here. anyone found solution that they would like to share, also I don't smell gas outside the car and nothings dripping
 

i12drivemyMP5

___ 323F ___
Contributor
bump I have had this code also I got a new gas cap and it's still here. anyone found solution that they would like to share, also I don't smell gas outside the car and nothings dripping
Did you see post #4? If so, did you check yours?
 
:
impreza
yes I did, I checked, I also checked:
purge valve-good
catch can-good
hoses-no leaks, at least not visible,
gas tank-not cracked

now I need to check charocoal canister and valves and air filter.

I have question, If I found out that something's not good and replaced it, would the CEL go away on its own?
 
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i12drivemyMP5

___ 323F ___
Contributor
I think that may dependent upon the type of CEL but if it doesn't then just pull the neg battery cable off and let it cycle thru limp mode.
 

slavrenz

Riddle me that!
:
2001 Mazda Protege LX 2.0
yes I did, I checked, I also checked:
purge valve-good
catch can-good
hoses-no leaks, at least not visible,
gas tank-not cracked

now I need to check charocoal canister and valves and air filter.

I have question, If I found out that something's not good and replaced it, would the CEL go away on its own?
just take it to an auto parts store and ask them to clear the code - if they give you s***, just tell them you don't feel like waiting for your car to relearn driveability settings because you disconnected the battery cable.

As for the code, I've never heard of anyone else getting this code that didn't have a vacuum hose loose (myself included), so just check and check again all of your vacuum lines for looseness.
 
Dam I got the sam thing going on, P0455. I allready check the lines, and check the gas cap but no luck. Is there n.e one here that could give suggestions? And about post4, I don't see where's there suppose to be a line from the purge to throttle body.
 

pcb

The Diagram Dude
:
2002 MP5
You've got a small EVAP leak... Your cracked intake tube has nothing to do with that (although you do want a new one)



There's a 95% chance that you have a bad purge control valve...

They're kinda steep at Rockauto... EBay has better prices.



 

pcb

The Diagram Dude
:
2002 MP5
It's quite easy to test the valve but it's been opening and closing for more than 15 years and they eventually wear out.

Throwing a $20 part at it isn't that big of a deal...



 

pcb

The Diagram Dude
:
2002 MP5
I don't know what happened with my previous pictures?

There's a good chance it's your purge solenoid valve.

Check your gas cap too.








They're kinda steep at Rockauto, eBay might be a better bet.

Make sure you check the picture to compare, there are all kinds of different names for the various solenoid valves.


 
:
Mazda protege5
Put a new cap on the 02 but I havnt been driving it so I ant tell if it did anything really. Ima swap it to the 03 and if that doesnt fix it ima go for the PSV
 

pcb

The Diagram Dude
:
2002 MP5
Check the metal mating surface of the filler pipe for rust and crap.

I fixed my friend's EVAP code by putting some grease on the mating surface and gas cap seal.
 
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