So I'm getting the P1457 CEL that I've been reading about. Its on my 02 SE. Someone posted a service bulletin from Honda regarding it (http://s2ki.com/stor/library/TSB/a03-001.pdf) which pretty much describes my situation as far as the problem, driving conditions, geography etc. However, I'm having problems figuring out WHERE the bypass solenoid is. In looking at a couple fiches I'm not seeing that specific part number listed. Is it normally bundled together with another part? Can anyone point it out to me? Is it one of the valves in this picture?

 

Valve set, solenoid....#6 in your pic. Not saying that is the issue....just translating the terms.

 

I'm curious, did this fix your issue. I've read elsewhere that the p1457 is most commonly the canister vent shut valve (cvs valve). This is the first i've heard about the bypass solenoid being the issue.

 

It did end up being the shut valve and the canister. My car is fine now.

 

was it giving you any other issues besides the code it was throwing. I have this code right now and im trying to decide if i should fix it or wait a while.

 

and how long did it take you to replace this?

 

A P1457 code came up on my friend's 1999 Honda Accord(2.3L, four cylinders), along with a fuel smell after driving. My friend and I found that his Accord's Evap Two Way Valve was missing the two O-rings shown below:

My friend and I installed two O-rings we had handy from salvage yard parts. So far so good.

How did the O-rings go missing? Sixteen months before, my friend paid a shop to fix a P1456 code. The shop replaced the Evap Two Way Valve. The P1456 code went away. Then a day or so later the Accord threw a P1457 code. My friend has been living with this code ever since (over 16 months now). How did we know the O-rings were missing? My friend and I went to a salvage yard and bought a bucket of 1998-2002 Evap system parts (charcoal canister, Evap Two Way valve, Evap bypass solenoid valve, Evap vent shut solenoid valve, fuel tank pressure sensor); cleaned them all; and tested the two solenoid valves. The salvage yard Evap bypass solenoid valve failed the test. My friend and I unfastened the salvage yard Evap bypass solenoid valve from the salvage yard Evap Two Way valve and saw the two O-rings. Then my friend and I unfastened his Accord's Evap bypass solenoid valve from his Accord's Two Way valve and found no O-rings. Conclusion for now: The shop in 2020 did not install any O-rings.

For do-it-yourselfers, replacing the canister and the several parts in and around the canister (two solenoid valves; two-way valve; pressure sensor) is not difficult. My friend and I did jack up the rear left of his Accord; placed two jack stands on the inboard end of two of the control arms; then lowered the Accord onto the jackstands. We put a huge wood block under what looked like a hefty structural member a few feet forward of the Accord's charcoal canister, as a back-up.

​​​​​​The Honda p/n for the 2.3L Accord's Evap Two Way Valve is 17371-S84-A01.
The equivalent Dorman p/n is 5981-01427860.
Photos on the net for both these part numbers seem to indicate the O-rings come with the valve.

Two-Way Valve O-ring part numbers (two different O-rings):
91392-S02-000, replaces 91392-SV4-000
91393-S02-000, replaces 91393-SV4-000

Also consider a new vent shut valve O-ring, part number:
91391-S84-A00

More discussion of how the Evap Two Way Bypass Valve O-rings have caused a P1457 code:
https://www.hondaaccordforum.com/for...ispreloading=1