Engine Code P0455 on 2003 BMW Z4

Can anyone tell me what P0455 code is? Autozone has a Vacuum leak, but not sure about this. Can anyone tell me the exact problem?

Asked by for the 2003 BMW Z4
The exact problem is: there is a large leak in the EVAP system. It could be a simple thing as a missing or non sealing fuel filler cap, but for the rest you need a repair shop to test (possible smoke test) the EVAP system.

2 more answers
Hello Jcslmia, There is a very good article in the RepairPal Encyclopedia about the OBD II Code P0455. It means "Evaporative System Malfunction, Gross Leak". Follow this link to learn more about it; http://repairpal.com/OBD-II-Code-P0455
yes you have a vapor leak.you will need to have car smoked.There is a machine which will inject smoke into your vapor/vacuum system.This is a very common problem.Take your car to a local bmw indepent shop.cost for this test is under 129.00