P1457 Evap Code
 

On my 03 Civic I get P1457 Evap code. I reset it and it came back after driving about 200 miles. I have ordered Honda OEM Gas Cap and I will replace it to see if that takes care of the problem. People are talking about several valves and canister etc; Instead of replacing one valve at a time, do you know if you buy whole canister it comes with all valves etc? I'm getting this done by a mechanic and don't want to go back and forth and every time he charges me by the 1/2 hour, one hour. Any thought on what usually is the problem with this kind of code? Might just get lucky replacing the usual suspects. I know smoke test is the way to go, which should pint point to where the leak might be coming from.

Re: P1457 Evap Code
 

there are lots of threads around here regarding that code just do a search,

the most common problem is the cannister shut off valve is leaking, i would suggest replacing that to start, it is held onto the cannister with 2 screws which in most cases are rusted to hell,

your gas cap is not the problem