I gave the dealers $438 to change the power steering coupler and I swore I wouldn't give them another dime. I'm not very mechanical at all but thank God for YouTube and the logic to not trust the first video I see every built my front end on mine and done quite a few things to it pretty much no mechanical experience at all before this

 

treatment for moisture in the gas (water) not the fuel system like most 'cleaners'. Unfortunately the light came back on again some months later...so it HELPED but didn't solve the problem...seems to be a money grab for Kia dealers (at least Kia, maybe more?) to just keep 'trying' by replacing parts. Still not fixed, trying the fuel filler pipe next as Kia found some rust on it and thinks that is where the leak is (I have replaced everything else if could be, so maybe...but I'm not giving the dealer $1500 CAD to replace it!)

 

I have had this problem with my 2019 Optima for years now, tried everything...last year I put some strong 'dry gas' in and the light went away for a while....and came back on this winter - several mechanic replacements later the Kia dealer says sometimes moisture will get in the charcoal canister (VERY expensive to replace) and form ice or mess up the reading, so 'dry gas' made some sense. It's off now after replacing the Fuel Pressure Sensor but if it comes back we will pursue what the dealer said.

 

What is dry gas I never heard of it

 

I have a 2011 sonota limited for the past year and a half I Ben trying to fix this p0456 evap code I replaced everything I did the vent valve the purge valve the gas cap the fuel pump and lock ring the fuel tank pressure sensor and the charcoal vapor canister and I’m still geting this dam evap leak code it’s driving me crazy everytime I get my car back as fixed it never is it was smoke tested 3 different times by 2 different people one was my father no one can find a evap leak anywhere with soap and water no smoke comeing out anywhere I’m stuck why am I still getting this code I replaced the whole fuel system basically and yea I used all oem Hyundai dealer parts all oem Ann lines and hoses look good car runs and drives fine I just can’t seem to get this light to stay off it’s the same code everytime going on 2 years now I have inspection comeing up am I missing something here cause no mechanic can help me anywhere I bring it they can’t find a evap leak anywhere even the Hyundai dealer couldn’t find the problem I’m stuck help anyone am I missing something here

 

Where did you pump in the smoke for the smoke test? The ORVR system makes smoke testing more difficult.. (You can't get smoke everywhere that your computer tests under vacuum when it runs the P0456 leak check if you connect your smoke machine at the purge valve like on most cars.)

 

FOr me, neither the gas cap or FTPS solved the problem. Installed new factory gas cap and factory FTPS. Reset the ECU. CEL returned after about one tank of fuel. Reset ECU again and it returned again about a week later. I guess I'll have to break down and have a smoke test. Frustrating because I had it done once already, but I think the shop did nothing other than reset the code and charge me.

 

An easy 10-minute job to replace the sensor which is located above the fuel pump. You'll need a 14mm socket on an extension to remove the back seat cushion as seen in this video.

 

What symptoms did you're vehicle have when it had this code?

 

No symptoms. The car runs perfectly other than crappy MPG (24-25 highway), but I don't know if the poor mileage is related to the code.

 

Alright, just changed it. Took roughly 10 minutes. I was able to find the sensor for $30. I cleared the code and hopefully it stays gone, we'll see tomorrow when I go to work.

 

So a little update for everyone. I'm out in California with my car now, no evap codes. YEA!!!!! (waves arms like Kermit the frog) That Fuel Tank Pressure sensor was the pain of my existence. Oh well. If anyone has any computer code problems that is reading this thread, let me know and I'll try to help the best I can.

 

I have a p0420 and p0455 code on my 2016 kia rio hatchback what would need to be done to fix both codes

 

Many years ago I took my new at the time 1992 GMC Sonoma in for an oil change and they somehow cross threaded the drain plug and must have used vice grips to tighten it because the hex on the bolt was gone. It didn't leak so I didn't notice it until the next change, I've done all services since then. Amazing.

 

It sounds like the real lesson here is to not use Belle Tire. Sorry about your bad experience.

 

Might be something I need to look into, I've already changed the evap solenoid, gas cap, and the sensor at the rear of the car. The name of that one escapes me right now. After each install I reset the codes and they come back over time.

 

Kia Soul: Components Location - Evaporative Emission Control System - Emission Control System

if it's the one at the back, it's the Vent Valve, if it's on the fuel tank, it's the Fuel Tank Pressure Sensor. I included a link to the diagram.