P1456 on the OBD reader - gas cap the likely culprit?

O

osoda

New member
I am working on a 1999 Honda accord coupe that had it's check engine light turn on, convenient right after getting a registration renewal requiring a smog check (zing!).



I connected an OBD 2 reader and it gave a P1456 code which indicates some kind of evaporation leak.



I popped off the gas cap and found the rubber seal has a couple cracks, one of them quite large.



Do you guys think this would be the likely cause of the leak?



Or am I looking at something more serious, like a bad valve, etc?



Pics are below, the biggest crack can be seen in the upper left area.



All advice is appreciated, thanks again.
 

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Reset the light first and see if it comes back on, if it does replace the cap, if it comes back there is a leak somewhere else.
 
As a follow-up, the new gas cap did the trick.



Unfortunately, the CEL lit up after 100 miles and this time the OBD reader is saying P1164. Which looks like the primary A/F sensor is going bad. Which is really sucky because the accord uses an ULEV F23A4 engine, which apparently uses a special A/F sensor that you can pretty much only buy from Honda, and runs about $250-300 for the part alone.



When it rains, it pours =(.
 
well, everything ended much better than i expected. I used the obd reader to clear the p1164 code, filled up the gas tank to max, tightened the gas cap, and had the car driven 200+ miles before I decided to start pulling and replacing parts. And for whatever reason, the code never came back. The car passed the smog test with flying colors, so I'll take it as a lesson learned, don't be in too much of a hurry to start replacing parts.
 
glad the issue is fixed. Also if you need a 02 sensor you do not have to go to the dealer. They will usually run about $100 a lot of times even less then that depending on what kind you decide to purchase.
 
a quick search yielded me some great results. 02 Sensor will actually help yopur car run better and help with your gas mileage.



I found a Denso 02 sensor which i have used for $55 brand spanking new. Very easy to replace as well.
 
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