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As noted above, P1484 is an indication of high pressure in the EVAP system, an indication that the EVAP system is not working correctly; it does not necessarily mean you should change out a $300+ module until you have determined that it is actually bad. The EVAP system is supposed to get rid of excess fuel vapor into the intake system to burn it off, the leak detection module periodically tests the EVAP system to make sure it is not leaking. The code indicates that the EVAP system pressure is too high, which may be the module, but often is not. The normal way of testing the module is with a smoke test unit to make sure it is closed when it is supposed to be. The attached is the function diagram for the same module on a BMW; as they all work the same way, this should help you understand how this unit functions: How the leak detection module functions1 point