P0455 Evaporative Emission Control System Leak Detected (gro

[Aduzi]

Hello Volvo Owners,
Just bought a 96 850 GLT non/turbo. The check engine light keeps coming on during its first tank of regular gas. There were already 6 gallons in it and it had been sitting since last November. The guy at the auto store put his meter on it and said it was an emissions control problem. He also said that emissions control has been a problem with many other makes and models. He attributes this to bad or inadequate gas or gas that has been sitting for a while and suggested using a higher octane and then resetting the light. What does anyone think of this theory?

Aduzi

[marginal]

I have this problem for about a week now.
Today I went to see my mechanic, and he told me my EVAP Canister Purge Valve is under my left fender's plastic shell.
What do you think about it?

Thanks.

[Ozark Lee]

Welcome to MVS aduzi,

Bad gas can cause all kinds of problems and a tank of the best premium you can find and some Seafoam or Techron added to it won't hurt anything either. Did you happen to get the code number(s) from the scan?

The actual P code numbers go a long way on helping us to guess.

...Lee

[Ozark Lee]

Marginal,

On my 850's the charcoal cannister itself is located as you described but, as I recall, on all of them the purge valve is located over towards the (US) driver's side of the fan shroud between the headlight and the fan.

...Lee

[marginal]

Thanks Lee ...

[DGM]

In my book the EVAP codes are the worst to diagnose. It is like chasing ghosts .

Recently when i had a gross leak code, i was responsible for it. We had to lower the subframe once. On the right side about in the center of the subframe there is an union on the EVAP tubing coming from the back to the front. I reatttached the rubber union but it was streatched to much.

Finally It gave up and was simply holding on its tip and leaking through air. Easy fix but it can be hard to find without a smoke machine.

May be something to check before blaming other components of the system. Regards

[marginal]

Marginal,

On my 850's the charcoal cannister itself is located as you described but, as I recall, on all of them the purge valve is located over towards the (US) driver's side of the fan shroud between the headlight and the fan.

...Lee

Well, it turned out to be my Canister Shut-off valve / Vent Valve that's inside the front left fender under the plastic shell, that is defective.
Anyone has a drawing and / or P/N on that valve?

Thanks.

[Charles32]

I disagree with the assessment, I'm not very mechanically inclined, however, I have the P0455 code also. And I bought and after market gas cap, but kept mine normal one on, and started looking for cracks. The J hose many, many times is cracked as mine was in 3 different places on the ends where the clips tighten. Also, the is another hose that connects to the valve or canister, can't remember, but it's about 18" long with a 4" L on the end of it, and they crack, A LOT, on the end that connects to the metal pipe part.--part is plastic or metal, then there is a connection for the rubber hose to connect. In any case there are a plethora of things it could be besides the lines.

I drove the car, and it went about 100 miles before the code came back. So I went and picked up a purge valve, up under the radiator shroud, swapped it out, tried the new gas cap, and the code came back within 30 miles.

Put original gas cap back on, in the morning I will be checking the line that connects to the purge valve under the radiator shroud and goes all the way back to canister by lighting a cigar and blowing the smoke down the tube while the car is jacked up. If it's cracked it'll show and I will replace that. If that's not it, then I will replace the elbow under the battery, the elbows by the canister, and also look at the canister to make sure it is good, while replacing the canister valve and purge valve.

The air pump check valve can also be a problem, however, if it is and it's bad I have read countless posts that the air pump soon after goes out. My air pump is fine according to many peoples test. TEST by putting your hand on the hose coming up from under your batter tray and going back to between the engine and fire wall. When the car is first started in the morning the air pump engauges I guess to help with the emissions system till everything heats up and is ready. IF YOUR PUMP WORKS, you will feel the air pulses going through that hose when the car is started on a cold start. Soon after when the car is warm the pump shuts off. My pump does the same so I figure my check valve is fine, but will test it also and see if it holds 50 millibar for 20 seconds and if not replace it. If it holds then I will replace the canister valve in the rear and reset, I thinks its safe to say if after all that the light comes back, then I will have to replace either the canister itself, then the air pump.

[Charles32]

Ok, so after swapping out the purge valve and putting the old gas cap back on, I got another engine code, I assumed that it was P0455 but it wasn't, it was P0108. So I changed the canister valve to see if it was faulty. The code came back, so I will check it this morning and if it's P0455 then that tells me the other canisster valve is bad and to put on my original one because the code went away with it. If it's not the P0455 and it's the P0108 then I just have to replace the MAP sensor and P0455 is solved.

No visible cracks in any lines all the way up, it was the purge valve under the radiator shroud, the J hose and the evap canister hose the 18" long with a 4" L on end hose.

Now to get rid of the P0108

[ppong77]

Hi,

I just wanted to say "thanks!" to all of you who shared knowledge/pain/frustration/solution from dealing with P0455 code. My mother's 2000 S70 Non-Turbo had this problem and obviously she failed the emission inspection. Well, I decided to tackle this thing by myself. In my case, as was the case for many others, J-Hose and L-Hose were the culprits. I first replaced the EVAP purge valve that's on the radiator shroud, but that didn't solve anything.($50 wasted, but oh well...)

thanks again,

H.