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Tom
Tom, ASE Certified Technician
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Experience:  ASE Certified Master Technician
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BMW X5: OBD 11 Code PO455, which means gross leak

Customer Question

My BMW X5,2002 3.0 is giving OBD 11 Code PO455, which means gross leak in evaporation system. Where should i start to trace the problem
Submitted: 9 years ago.
Category: Car
Expert:  Tom replied 9 years ago.
First thing to check is the gas cap as it could be missing if the cap is ok then the evap anister could be bad but start with the gas cap
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Customer: replied 9 years ago.
Gas cap is there and looks fine. Code defination said "gross leak" what could be wrong with canister to produce that kind of leak, and what is the best way to detect this leak
Expert:  Tom replied 9 years ago.
Need to have the gas cap tested for leaks and it could be the canister gross leak means large leak alot of time a smoke machine can pinpoint this leak when hooked up to the evap system the smoke will come out of the plce where its leaking this usally costs about 100 dollars for this test
Customer: replied 9 years ago.
although i am accepting this answer so that payment can go to person answering, but really i was expecting much more detailed and comprehensive answer.All the information provided is available in various repair manuals.Any way, good luck !

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