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Discussion Starter #1
I decided to swap the air filter with a K&N filter over the weekend and then today on my way to work I noticed the Check Engine Light was on.

I scanned it for codes when I got home and it said P0455. There's really nothing to it when it comes to changing the filter so I can't figure out what happened. I checked around the intake to see if I somehow knocked a hose or plug loose, but everything seems secure and normal.

Any thoughts or suggestions on what I can do? :confused:
 

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Lol. I'm assuming you already checked to make sure your gas cap is tight? Thats the quick fix. I had the issue on my Veloster and it was because the purge control valve was stuck open. The dealer replaced it same day with no appointment under warranty. Took about 30 min.
 

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P0455 is emissions related, so the filter had nothing to do with it. Step one is to make sure the gas cap is tight. If that doesn't work, it's dealership time. P0455 is actually really common for these cars, especially in cold climates.
 

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Discussion Starter #4
It's been about a week since I filled up with gas so I didn't think it was the gas cap. Purge valve came to mind for me too. I actually had to have mine replaced on my old Veloster as well... so not uncommon there. Just seems like too much of a coincidence to happen at the same time I changed the air filter.
 

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Discussion Starter #5
P0455 is emissions related, so the filter had nothing to do with it. Step one is to make sure the gas cap is tight. If that doesn't work, it's dealership time. P0455 is actually really common for these cars, especially in cold climates.
Thanks, guess I'll have to bring it to the dealer.
 

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Discussion Starter #7 (Edited)
Make sure you didn't hit purge valve accidentally, it is around that area of the air filter!
Where is the purge valve located? I just want to double check every thing before I bring it in just in case it was something I did.

EDIT: Is this the purge valve?
 

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Can I ask you what would happen if the purge value was not fix and the car was driven for 20,000 km?
Car should drive fine. No idea if it would hurt anything.
 

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2017 Hyundai Elantra Sport 1.6 turbo Phoenix Orange
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Probably hurt gas mileage, i did notice a difference. I had thought it was my K&N filter also. I email them (tech dept.) and they said nope not possible. I then took the car to a shop an the code said large evap leak (some thing like that. then i went to dealership and they were trying to convience me that i came into thier shop with my gas cap loose said they ran a presurre test of some kind and wanted to charge me 1/2 hr labor. I refused to pay cause i knew my light would come back on and it did.
 

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2017 Hyundai Elantra Sport 1.6 turbo Phoenix Orange
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It's been about a week since I filled up with gas so I didn't think it was the gas cap. Purge valve came to mind for me too. I actually had to have mine replaced on my old Veloster as well... so not uncommon there. Just seems like too much of a coincidence to happen at the same time I changed the air filter.
Just a few question. Are you the only owner? Did you ever hear a pop sound from the engine area?
 

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Probably hurt gas mileage, i did notice a difference. I had thought it was my K&N filter also. I email them (tech dept.) and they said nope not possible. I then took the car to a shop an the code said large evap leak (some thing like that. then i went to dealership and they were trying to convience me that i came into thier shop with my gas cap loose said they ran a presurre test of some kind and wanted to charge me 1/2 hr labor. I refused to pay cause i knew my light would come back on and it did.
Code is probably P0455, very common on these cars. Large temperature swings seem to send it off, it doesn't like cold weather mainly. A lot of people will see it in the winter time or in the spring/fall when the temperatures are changing. You can either pressure the dealer enough that they replace the EVAP solenoid (it's not the gas gap) or you can buy a cheap bluetooth OBD scanner and download an app on your phone like Torque Pro and clear the code yourself whenever it pops up.
 
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