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Old April 11th, 2016, 11:29 AM   #1
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Evap System Code Help and DFW TX Shop Recommendation

Hello, my 06 accord has been giving me two codes one of which has been intermittent for some time but now constant. The two codes are p0455 Large leak and P0497 low purge flow. I'm getting the check gas cap message on my instrument cluster as well. I've replaced the evap canister, the canister vent valve/solenoid, fuel tank pressure sensor and the gas cap all oem and still get the codes. Does anyone have any suggestions or had any previous experience with these codes and if so what was your resolution? Does anyone have any DFW TX shops they can recommend? Thank you

Last edited by rollaboy_95; April 11th, 2016 at 11:29 AM.. Reason: typo
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Old April 11th, 2016, 03:41 PM   #2
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I'm not able to provide an answer or suggestion for the issue, but Hond-Auto is who I use when I can't fix it myself. Hond-auto.com - Auto Mechanic, Factory Maintenance, Mechanical Repair
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Old April 11th, 2016, 03:50 PM   #3
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Thnx
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Old April 13th, 2016, 03:33 PM   #4
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If you are near Richardson, Absolute Autowerks is pretty good at diagnosing stuff.
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Old April 13th, 2016, 05:18 PM   #5
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If you are near Richardson, Absolute Autowerks is pretty good at diagnosing stuff.
I appreciate that.
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Old April 14th, 2016, 04:58 AM   #6
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I have seen this, turned out a critter chewed up the wires near the evap canister......
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Old April 14th, 2016, 09:32 PM   #7
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I have seen this, turned out a critter chewed up the wires near the evap canister......

Yea that's not the case with mine. I personally replaced the canister and everything and have checked out all of the wires and lines. I researched some civic guys having this code replaced the purge valve and it resolved their issue. Going to order one but also my codes seem to go away as long as i have a decent amount of gas in the tank which makes sense. Will try and get it inspected tomorrow and then follow up with repairing it.
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Old June 26th, 2016, 08:40 AM   #8
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Did you get this inspected and repaired?
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Old June 27th, 2016, 08:56 AM   #9
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Are you running anything custom in your fuel system set-up? Because that CAN cause issues with the evap system pressures. You could very well have dry-rot in one of the lines that runs from the engine bay back to the canister. Also, I know its a p.i.t.a. but remove all the lines at their leads and add a very small amount of vaseline (make sure the lines can handle petroleum based product first) or a thick moly grease. This will assure there is no air entering or escaping the system at the connections. The fact that both codes and your gas cap indicator are on says there is insufficient vacuum in the system. I just had to replace my canister purge valve a few days ago actually. One other thing that I forgot to mention, when you bought the part did you make certain it was for the gas engine and not the hybrid? They are identical casings but different parts.
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Old June 27th, 2016, 06:33 PM   #10
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I was able to get it inspected bc when the tank is pretty full any codes go away and as long as you just have one readiness code not set and no current faults then you will pass the tx emission. I have replaced the evap canister and sensors im thinking it maybe one of the lines connected to the tank but havent had time to further investigate.
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