Quote:
Originally Posted by BMW_Diesel_Owner
How do the 2 reservoirs work? Does the vehicle use the active reservoir first (the one located on the passenger side), and then give a warning message when it starts using the passive reservoir (the one located on the driver side, under the air intake)?
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Under most circumstances the active tank is keep pretty much filled by transferring DEF from the passive tank. You will receive a warning once the passive tank is empty and the active tank reaches a certain level to remind you to fill them. If the SCR system is not operating properly to met emissions standards - that is another issue and causes an "Incorrect Exhaust Fluid" warning. This should not be ignored and should be addressed by your dealer straight away.