Codes P1457 and P1456?

PacmanTypeR · 2025-02-10T23:41:20+00:00

The vehicle listed above is a Type R. I have been chasing this code or some time. I am moving to a state where emissions are necessary despite the age of the car. I have taken my car to the dealership multiple times and still have not been able to resolve the code The following parts have been replaced: Two-way valve Purge valve solenoid Charcoal canister Fuel gas cap (I know this is another code P1456) The hoses Vent shut ECM These parts are all OEM except the hoses, I decided to replace them with a heavier hose type. I've also tried to tighten up parts of the system in case vibrations are causing the issue. It appears the particular dealership is at a loss on what to do next and suspect an intermittent electrical and recommended just getting an aftermarket PCM that won't check for this. But as mentioned this won't work for my new location. I've tried to complete a drive cycle with a total of 100 miles, but still shows incomplete on the evap. The last time it was triggered, it took about 400 miles. I've included a video of the last visit. Please help.

2001 ACURA INTEGRA

110,000 MILES • 1.8L • 4 CYL • 2WD • MANUAL

PACMANTYPER

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54 POSTS

I finally got to test drive my car long distance with a few drive cycles. The light stayed off for about 800 miles and finally came back on for P1457. It usually came on at 300 so there is some progress. I am not sure what else to check. :( The only component that hasn't been replaced with a brand new part (only used) is the canister purge valve. I did replace the hoses but had put the original hoses back in a while back. Maybe I can swap those back with the replacement non hoses. I had to use gas line hoses since the oem ones were discontinued.

Sep 15, 2025 at 4:54 AM

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Frequently Asked Problems for This Vehicle

Engine won't start
Engine stalls while driving