Question about 1999 Honda Accord

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My check enigne light is on. but the light flashes in and out. the check engine light has to do with my evap system and i have taken it to a shop 3x and they still havent found the issue. cant figure that one out either. replaced the 2way valve first then ran a smoke test and the tech couldnt find the leak. i could definitly use some help on this one.

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An evap code is common with these cars when the gas cap is not tight enough. Make sure you always tighten the cap a minimum of 3 clicks. Try tightening the cap and resetting the code to see if it comes back on.

Good Luck!

Posted on May 26, 2011

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Posted on Jan 02, 2017

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What hoses do I check for check engine light code Po455


DTC P0455 Evaporative Emissions (EVAP) System Large Leak
The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge solenoid valve OPEN and the EVAP canister vent solenoid valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge solenoid valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or the vacuum level decreases too rapidly, this DTC sets.
There's more to it that just checking a hose ! Smoke testing the EVAP system is the best way to find leaks .
  1. Inspect the Evaporative Emission (EVAP) System for the following conditions:
  2. ?€¢
    A loose, missing, or damaged service port schrader valve


    ?€¢
    A loose, incorrect, missing, or damaged fuel fill cap


    ?€¢
    A damaged EVAP canister purge solenoid valve

  3. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Inspect the EVAP system for the following conditions:
?€¢
Any disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses


?€¢
A damaged EVAP canister vent solenoid valve or EVAP canister

Your best bet is take your vehicle to a ASE certified repair shop or the dealer , where they have the tools an knowledge .

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I would bring it back to the shop that did the work. If the code is coming out as a problem with the evap system it is not abnormal for the system to take 2 or 3 days for it to read again.

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It does need reset. Try a local AutoZone or parts store that does free check engine lights. Any repair shop will charge diagnosis.

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