Hi, not sure if your my subframe bolts are same as mine ( 03), but if so, the one to watch is the nearside front (UK). If you look under the bonnet you will see that this one bolt is not captive and the end of the thread is upwards and exposed to the elements.
This one was seized on mine and snapped when trying to remove.
I suggest a liberal soaking with penetrating oil for a few days before any attempt to remove and of course make sure the socket is not worn and a snug fit on head of the bolt.
Mine had to be drilled out but as it is not captive, a nut could be fitted on a longer bolt.
Hope this helps.
John l
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