I've found this forum to extremely helpful. Thanks to all the Honad experts out there who provide great help! I do have a question about the P1457 code and the evap control system that I'm not sure has been discussed. If it has been, I apologize. In an excellent summary by Jim Blake about this code and the possibilities of causes, he stated that the way the car runs is not affected by this problem. Other than possibly leading to the failure of the PCM, does it not affect performance or gas mileage at all? My CEL has been on for 3 or 4 years and because it was the only code I have, I always blamed it for the times I thought my 3.2 2000 Accord didn't run as smoothly as I expected or had the power I felt it should have. If it's gone this long without the PCM going and there are no other issues connected to it, maybe I should just leave it be? When I had my catalytic converter replaced two weeks ago, the mechanic suggested I replace my 02 sensor that plugs into it. Any input would be appreciated. Thanks again, especially to Jim Blake. -- Dennis

 

I'm one that would address any codes that come up on a car.

So if you have an evap issue I would get it taken care of.

As for the O2, since the cat needs to be replaced it will be right there, if it (or the other one) has never been replaced a good time to do so.

 

I'd fix it. First, when the CEL is always on you never know when a NEW unrelated problem comes up because the CEL is already on.

Next, the gas tank is not openly vented to releive pressure. That's what the EVAP system does. There ARE some failures that might allow the tank to become pressurized and you don't want it to burst.

Also, I'm in favor of leaving some form of breathable atmosphere on this planet for my grandkids.

 

Thanks so much poorman212 and Jim. I appreciate the advice, and will get the problem taken care of. I called a reputable auto electric place, thinking they would be a place to tell me what I need to replace. The guy on the phone didn't seem to know what an evap cannister is -- or what they would or could test. He came back to the phone a few minutes later and said I needed to bring the car in and they would do diagnostics on it at $65 an hour, 1 hr min. Seems to me that the shutoff valve is the most likely culprit (80% of the time?) and I might as well replace that first for half or more of the price of the diagnostics.

 

Thanks for the post from here that I got my 1998 honda accord fixed.
Thanks JimBlake your posts help me a lot!
My car with the checking engine light, code is 1475.
I have someone replaced the shut vent valve first,(cost $50+$100 ) but still CEL on.
Repairing store checked it again and they said need to replace 3 parts: fuel pressure sensor, two-way valve with the bypass solenoid. Need about another $400.
I just bought only the solenoid from online, including tax and shipping, about $95.
When I replace it, it's a little bit hard to separate the solenoid from the two-way vale. So I saw those two washers off finally using about 20 minutes. Other parts very easy!
After the fix, now it's about 200 miles already and everything is good, no CEL . ( Normally it will come back about 20- 90 miles if not fixed) During I unplug those hoses on the two-way valve, I found oil( gas) drops inside it. ( I think it's getting from the tank side hose, and since the solenoid didn't working, so its there.) I see no crack or leak out side the two-way valve , it's plastic and not easy broken. I press my finger on the holes of it and blew air into it, seemed working good. So I think its good. If not working, I will replace pressure sensor next, and then last one will be the two-way valve.

For those who have the same EVAP system leak, P1457 code, my suggestion :
First, check those hoses under the car, unplug them one by one, see if something abnormal. Or gas smell. (Since from tank side hose, gas will come into the EVAP system, including those vales) It's very easy to do that.
Second,
following the TBS, replace the rusted solenoid if you see its rusted. Also you can test them using JimBlake and others' posts. For me I used $40 have someone smoked the car, narrow the parts to replace. With those results, you can choose those electronic things to replace(for the salt snow area pl). In my case, no need to replace the two-way valve.
Hope everyone good luck!