Our 2004 had the same sensor problem. Part was backordered for 2 months. Looking at the part #, it appears that the entire seat cushion is replaced. No loaner. We simply drove around with the red airbag light illuminated on the dashboard.

__________________
David

Macan Turbo / 997.1TT (gone) / e83 (gone)/ e46 M3 / e90 335xi (gone)/ Sienna XLE Ltd
B7 A4 2.0T CVT (gone) / Pilot EXL-RES (gone)