[Rick N]

hey all first of all i need to thank everone here that has come to my rescue i have been working on my wifes 2001 mustang and was not sure of some things that were happening to the tranny thanks to everyone here i have fixed it and is working great that being said its now posting a 456 code and says that its a small leak in the evap system i have beeen told that it was the gas cap have changed it and it still pulls this code was also told there was a recall on this and not knowing wheather it was or not it was for sure im back asking for help with this any help will be appreciated because i really am at a dead stop i figuree its probably something simple but do not know where to start i am still not good at finding my messages so if you need you can email me at littlboo1@aol,com

thanks again
Rick

[232-K7]

Originally Posted by Rick N

hey all first of all i need to thank everone here that has come to my rescue i have been working on my wifes 2001 mustang and was not sure of some things that were happening to the tranny thanks to everyone here i have fixed it and is working great that being said its now posting a 456 code and says that its a small leak in the evap system i have beeen told that it was the gas cap have changed it and it still pulls this code was also told there was a recall on this and not knowing wheather it was or not it was for sure im back asking for help with this any help will be appreciated because i really am at a dead stop i figuree its probably something simple but do not know where to start i am still not good at finding my messages so if you need you can email me at littlboo1@aol,com

thanks again

Rick

p0456 is an evap leak, very small leak detected. (smallest possible leak)

did you replace the gas cap with an oem, or quality aftermarket cap ? inspect the O-ring gasket inside the fuel cap. if it is pinched or damaged, replace the cap.
do you lean on the nozzle when you refuel? that can damage the filler neck threads and cause them to leak.

if that all checks out, your going to have to either pressure test & vacuum test the system(leakdown test), or perform a smoke test.

if you start getting multiple different sized evap leak codes, (P0455-gross leak detected, P0442-small leak detected), it is more than likely your gas cap not sealing correctly.

[Rick N]

i mreplaced it with a good aftermarket cap but a friend of mine works at a for dealership and told me to get a oe that it would probably fix it i just hadnt done it yet but so far im only getting the 456 code nothing else yet will let you know whaty happens and thank you for your reply

Rick+

[232-K7]

try an oem cap.

i work at a hyundai dealership and sometimes cars will come in with a CEL for an p0456 evap leak, and the customer has already replaced the gas cap with an aftermarket cap. usually when i put a new cap on and then re-try the evap leakdown test, it will pass.