You might want to inspect your vacuum lines on your fuel pressure regulator. I had the same thing happen to me after I installed a nitrous system. It wound up being a split in the vacuum line on the FPR.

 

did your check light come on right away though? or only randomly?

 

I'm getting the same code (P1457) on a 99 Civic we just bought. Did you ever get yours fixed?

 

yes i fixed it, like the others said though.... it could be a number of things...... mine ended up being the purge valve....was your car in an accident or not? check the most simple things first like the fuel cap etc etc

 

This car has not been in any accidents. I pulled the valve off of the top of the charcoal evap canister. I have a lot of tools including a motorized vacuum pump. I pulled a vacuum on the valve when energized (it's normally open) and it held up to 16 inches of vacuum. I had read that the CVS valve was often the problem. I assumed that this was the valve I had tested, so even though I thought it was good, I replaced it anyway. The light stayed off for 2 days, but came back on today. I also pulled a vacuum on the charcoal canister, check the valve that allows the vacuum to go from the intake to the canister. Did a vacuum check on the lines going to the the canister, they are fine. I really need the troubling shooting proceedure for this system. I ordered the Helm's repair manual for $85 bucks, but this will take 10 days to get. Anyone have the trouble shooting proceedure?? Thanks

 

By the way, where is the purge valve located?