We use our XC90 on the weekends and for vacations. On the weekends, we average between 40 - 100 miles running around town going to events such as the never-ending toddler birthday parties.
Anyway, I didn't stop driving when I noticed the error. I thought it was a glitch that required the dealer to reset the computer. On the other hand, it was Saturday when I received the error so I wasn't planning on driving it after Sunday anyway.
Looking at my invoices, I didn't take it to the dealer until 7/13/09. I remember that they didn't have the part on my initial visit. It took 2 days for the part to arrive so it wasn't fixed until 7/15/09. I didn't leave it with them, I drove it home and took it back 2 days later.
My issue seemed to be a bad sensor but your issue sounds more severe. Maybe you should consider a second opinion. For your convenience, here is the information from my invoice:
SRS Light on ... USE SPO 09194009
Access Code SRS 0211, Replaced out of Range R/F Impact
Part Number - SPO 30724677
Description - Sensor
Total Charge for Concern 251.01
I hope this helps!
Keep me posted on the outcome.
2005 Volvo XC90 T5: 53,000 miles
2002 Toyota Solara SE: 188,000 miles
2001 Honda Civic LX: 90,000