How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Tom Your Own Question
Tom, ASE Certified Technician
Category: Car
Satisfied Customers: 25954
Experience:  ASE Certified Master Technician
Type Your Car Question Here...
Tom is online now
A new question is answered every 9 seconds

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
Tom and 4 other Car Specialists are ready to help you
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 !