Evap system leak detected. Evap incorrect purge flow.

[BlackTy]

I bought a 2008 Yaris Automatic a few months ago. The "Check Engine" light was on. The seller told me that it had something to do with "EVAP". He said it's an evaporative canister. I asked if it affected fuel efficiency, and he said it didn't. So I bought the car. But I noticed I'm getting 12 kilometers per liter (28 MPG). On my previous car, a 1995 Civic, I was getting 15 km/L on the same types of road/traffic.

Yesterday, I finally got to connect an OBD2 gadget to my car and got this info:


2008 Toyota Yaris 1NZFE 1.5L I4 Automatic

P0455(1 of 4) Generic Stored
Evaporative Emission Control System Leak Detected (Gross Leak)

Innova.com website describes P0455 as “EVAP SYSTEM (VERY) LARGE LEAK DETECTED”

P0441 (2 of 4) Generic Stored
Evaporative Emission Control System Incorrect Purge Flow

Innova.com describes P0441 as “EVAP INCORRECT PURGE FLOW”

P0441 (3 of 4) Generic Pending
Evaporative Emission Control System Incorrect Purge Flow

P0455(4 of 4) Generic Pending
Evaporative Emission Control System Leak Detected (Gross Leak)

The device we used is Innova 3100.


What do we do now? How do we fix this problem?

I now wonder if these four error codes affect my fuel efficiency.

[WeeYari]

Evap codes are like chasing the pot of gold at the end of the rainbow. I would take it into a shop with the ability to do a smoke test.

[BlackTy]

WeeYari,

Thanks for your reply. Is a smoke test all that's needed to figure out what the problem is? I'm concerned I'll have to pay for one test after another, after another...

[WeeYari]

Smoke test fills the evap system with smoke under pressure. Mechanic can very easily spot leaks.

[BlackTy]

I wonder how it got leaks in the first place. An evap is not something that is exposed, like a bumper is. It's like a human body's internal organ, right? How could it get leaks?

After spotting the leaks, do they just patch up the holes/gashes? And problem solved?

What about the "incorrect purge flow" errors?

[WeeYari]

Seals fail over time. I had an issue with a vehicle were a tiny bit of corrosion on the gas filler tube prevented a perfect seal with the gas cap. Threw a minor leak code. Smoke test revealed it.

Don't know what corrective action will be in your case. Depends on the nature of the leak.

I have a feeling that the combination of codes will be pointing to the canister. That potentially means $$$
Sent from my Elite_5_5_Octa using Tapatalk

[BlackTy]

RockAuto sells a vapor canister for $510.89 USD + $17.99 cheapest shipping to my USA address in WA. I'm willing to invest that much money if my fuel efficiency improves.

[BlackTy]

Is there a way I can diagnose the problem by myself? I fear paying a shop to take a look at the problem will cost a lot of money too.

[dogsridewith]

Wouldn't step 1 be to inspect all the hoses for loose, cut, weather-cracked? All the plumbing of the EVAP system, including tank filler/vent lines?
Done gas cap check? (The only emissions test in my county is screwing the gas cap to a tester internetted to the gubmint...costs more than a new gas cap.)

[BlackTy]

dogsridewith,

Can a neophyte like me do this hose/plumbing inspection?

I checked the gas cap by eye and by feel.

[WeeYari]

I fear paying a shop to take a look at the problem will cost a lot of money too.

Make some phone calls. What do you consider 'a lot of money'? I paid $115 for the diagnostic I had done, which included the aforementioned smoke test. At some point here, your time has got to be considered of some value.

Unless it was hanging loose, the gas cap would have thrown a P0456 (minor leak).

[thebarber]

also, no one in canada uses the number of km traveled on a liter of gasoline. its L/100km.

8.3L/100km isnt terrible for city driving in a slushbox. that your previous car did 6.7L/100km is great. but a 95 civic is a bit lighter on smaller, narrower tires. all things contribute to better fuel economy.

i used to commute in my echo 110km to work 3 days a week and going from a 175-65-14 to a 195-50-15 changed my FE by almost 1L/100km (5.9 to 6.8 or so)

[Vyaris07]

My Yaris 2007 got issue with P0441 code, read this forum and figured out the EVAP canister rubber is degraded, then :
1. Remove gently the canister out.
2. Wrap each very-end with office 1/2" wide clear-tape about 3-4 turns.
3. Re-insert the canister pipe back gently.
4. Bought two spring clamp 3/8" size, put on at least 1/4" from each end.
5. Run engine and turn on the code reader, clear the P0441.
6. Check the gas cap for clean-up the O-ring seal, then tied it up with 1-2 clicks.

After running idle for 5 min, read the code again, as result, no more P0441!
DIY is easy as this task! :drool: