Unending EVAP Problems - Toyota Yaris Forums

BabyBaluga · 09-08-2025, 08:55 PM

I am looking for help diagnosing a persistent EVAP problem that multiple shops haven't been able to sort out.

For context, the car is a 2013 Yaris Hatch 1.5l with 160k km

This is the first non regular maintenance issue we have had with the vehicle.

Symptoms:
When you fill the car at the pump (fill until the click and then stop), the car has a rough start, and sometimes takes a few tries to get started. Once it has started, we have no issues until the next time we fill it up. The car runs fine. After a week or so the CEL comes on, and the car continues to run fine with the exception of hard starting after filling.

The first shop we worked with replaced the purge valve. It ran fine for about a week or two, and then the issue came back. They replaced the purge valve again, and it was fine for a week or two again and then the issue came back.
They did a smoke test and didn't find anything, so they replaced the purge valve again. Again it ran fine for a few weeks and then failed. This happened a 4th time before they decided that the charcoal canister needed to be replaced because the evap valve inside of it might be broken.
We replaced that to the tune of $850. Ran fine for a few weeks and same issue.

This time we took it to a Toyota dealership. They did a smoke test and replaced the gas cap. They then must have tested it themselves because they are now telling me that it need a new charcoal canister. Keeping in mind that we replaced that canister 2 weeks ago.

We are a little tired of going around and around replacing the same parts.
Two smoke tests haven't found anything.

I am hoping that with the collective knowledge and experience of everyone here that we may get some suggestions of which direction to go with this.

Thanks very much in advance!

komichal · 09-09-2025, 12:34 PM

What codes are you getting? Is it always the same code or are you getting multiple codes?
I would be interested in the rollover valve - if is working properly. Maybe with a full tank it leaks gas to canister?
How about filling the tank up just to a half or so. If you keep doing it this way, does the error come back? If not then my bet would be on the rollover valve.

09-08-2025, 08:55 PM	#1
BabyBaluga I've made a post! Drives: 2013 Toyota Yaris LE Hatch Join Date: Sep 2025 Location: Ontario Posts: 1	Unending EVAP Problems I am looking for help diagnosing a persistent EVAP problem that multiple shops haven't been able to sort out. For context, the car is a 2013 Yaris Hatch 1.5l with 160k km This is the first non regular maintenance issue we have had with the vehicle. Symptoms: When you fill the car at the pump (fill until the click and then stop), the car has a rough start, and sometimes takes a few tries to get started. Once it has started, we have no issues until the next time we fill it up. The car runs fine. After a week or so the CEL comes on, and the car continues to run fine with the exception of hard starting after filling. The first shop we worked with replaced the purge valve. It ran fine for about a week or two, and then the issue came back. They replaced the purge valve again, and it was fine for a week or two again and then the issue came back. They did a smoke test and didn't find anything, so they replaced the purge valve again. Again it ran fine for a few weeks and then failed. This happened a 4th time before they decided that the charcoal canister needed to be replaced because the evap valve inside of it might be broken. We replaced that to the tune of $850. Ran fine for a few weeks and same issue. This time we took it to a Toyota dealership. They did a smoke test and replaced the gas cap. They then must have tested it themselves because they are now telling me that it need a new charcoal canister. Keeping in mind that we replaced that canister 2 weeks ago. We are a little tired of going around and around replacing the same parts. Two smoke tests haven't found anything. I am hoping that with the collective knowledge and experience of everyone here that we may get some suggestions of which direction to go with this. Thanks very much in advance!

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09-09-2025, 12:34 PM	#2
komichal View User's Garage Drives: Yaris 2007 1.3 2SZFE 64kW Join Date: May 2012 Location: CZ Posts: 335	What codes are you getting? Is it always the same code or are you getting multiple codes? I would be interested in the rollover valve - if is working properly. Maybe with a full tank it leaks gas to canister? How about filling the tank up just to a half or so. If you keep doing it this way, does the error come back? If not then my bet would be on the rollover valve.