The cross member may have just hit bottom, a not too uncommon occurrence. You may want to get a body shop to inspect for repair work. You may be able to see something yourself if you inspect the B-pillars.

But, I wouldn't despair if the repair work is good. At 16 years, your car has low resale value anyway, and if had a good long-term repair it shouldn't impact it much anyway. If it's safe, aligns well, drives straight and quiet, then it's a keeper.

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Prost!