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Hi, I've got a 2005 civic with 180k miles.. The p1457 code showed up. I had read it's related to the canister. I chedked the vent valve solenoid which seems a likely culprit, but it tested fine , actuates and holds vacuum. I also checked a solenoid right next to the drivers side end of the canister. The solenoid actuates, but I'm not sure it's working right. When not actuated, I can blow through the hoses. it is easoer to blow through when actuated, but I don't know a good test for this valve. I think it's just underneath the fuel tank pressure sensor. Any ideas? What are complete steps for diagnosing p1457?

 
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Are you in the rust belt?

 
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Yes, New Hampshire

 
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when i had 1457 it was my shut valve on the cannister

 
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I don't have a scanner that can command it shut, but when I put a 9v battery on it, it held vacuum.

 
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I'm thinking that other valve doesn't matter as it's between two closed points anyway, the tank cap and the canister when the vent valve is shut. I'll probably test the purge valve, and if that is tight, i'll have to do a smoke and mirrors test.

 
Rep Power: 132

Pretty good chance you will need to replace the By-pass (Canister) Shut Valve (CVS) and Canister for the P1457 code. Fairly common with these cars.

 
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Thanks NDNV. Do you have a picture or part# for that bypass shut valve?. I did a pressure test at the back end, and the canister, tank, filler hose all seemed to hold pressure. I also checked and tested the purge valve, and that was fine. I guess now I need to confirm that the vent valve is getting closed by the computer.

 
Rep Power: 517

Rusty CVS valve failing leak test @ 1PSI pressure:

 
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yup...thats pretty much exactly what mine looked like when i had P1457

i was lucky and managed to get the screws out by grabbing then with a small pair of vice grips