Last fall I had the fuel and brake lines replaced. The corrosive chemicals used in my state to clear snow and ice are known to do a number underneath vehicles. Before the fuel lines were replaced, I had a Check Engine Light with the related and somewhat common P1457 involving the EVAP system. After the fuel lines replaced with fuel lines (supposedly with material that won't corrode, don't recall what) the shop cleared the CEL. Soon after it returned. After about a month it turned off and has been off since. It may make sense as I believe the code is considered cleared after a few cycles of the EVAP process, but I was still concerned what would happen come emissions time.

Fortunately it passed the emissions test a few days ago. The code must have been due to the deterioration of he fuel lines. The car is running fine.Last MPG calculation was 28.2 with maybe 30% highway driving. The EPA rating is 28 highway. Possibly contributing to that is how I drive the 5 speed manual. I asked the emissions tech if he was ok with a stick. Of course he was, but he's seeing less and less of those lately. I just heard future Honda Accord sedans won't have a manual transmission option. So now if I win the lottery, I'll have to look for a leftover 2020 Accord Sport sedan with a 6 speed manual.
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Hopefully it was just the lines, but if not, it's often the evap canister and related items. I was super cheap, went to junkyard, found an old accord, removed everything in the evap area, crossed fingers, and installed it. Got rid of my errors.

https://www.youcanic.com/post/honda-...cause-solution

 

To add to my message above, one of the interesting things I found is that if you reset it and drive for a bit it wll pass emissions in my area because they don't count the evap error as important unless the CEL light is on. If it's on and there's an evap, then they fail it, but if it's off and the evap shows not ready (because it hasn't done it's two cycles yet) then it passes. So the previous year I simply reset it, drove about 40 miles and stopped at the inspection station, this way it hadn't done it's second cycle yet and it passed. But then I was getting tired of it coming on in the year, so I swapped out all the parts for it to get it to go away for good.

 

Interesting, yes I heard it's a complicated system where several components can be involved and it's not always clear which one(s) failed. That's great you were able to fix it with junkyard parts! There were visible holes in the fuel line return line before it was replaced, so I'm hoping that was the main reason.

 

Sounds like you got it. IN my case, I could never find the specific item, but I could smell the gas fumes, which told me something somewhere was not sealing up. And, yes, there are the hoses, the evap cannister, the charcoal box, and one other piece which I cannot recall. The good things is the whole area is easy to take apart, it's just couple of bolts (unless rusted, which is also why one tends to replace the whole section, because you can't get the part off). Anyway, great job, that error can be annoying since it takes so long to run through the cycles before you know if you got it.

 

Thanks but I can't take credit - it was done by Meineke! They fabricate their own fuel and brake line there. Had to have a short piece of brake line on my truck repaired there as well. I did hear that one of the challenges is unbolting the components due to rust. Congrats to you for tackling that job and succeeding - couldn't have been easy removing the components from the donor car.

I think it took so long for the CEL to turn off since I only drive the car a few days a week. I got to know the crew at Meineke by taking the company van there. I wish I had learned more and gained more experience on cars like some of you guys.