I´m not an expert but:

It has to be there, were marked;

if it is a new car, and the bag is not there, it will be "misleading"

if it is a used car, and the bag is not there, means somebody removed it after a chrash....

regards

P.S. in the rear, mine has only covers, no "airbag" signs as in other X5 with "Topline" equipment....

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-2006 4.8 is-