The wiring for the transfer case speed sensor can fail causing sporadic operation of the AWD (All Wheel Drive) system.Google+
Car Problem Reports
Saab 9-7x Sporadic Operation of All Wheel Drive System
Saab 9-7x Problem
Average Mileage: 94,353 mi (84,000 mi - 110,000 mi)
Visitor, 2008 Saab 9-7x, 103,267 mi
When I'm driving And i turn left or right. The car stops or staggers, or locks up. I can't pinpoint if its all wheel drive problem. I've taken it to shops, yes I've taken to a couple different shops and they think rear differential needs replaced(oil) or transmission. I think its what the problem says up top!!
Visitor, 2007 Saab 9-7x, 110,000 mi
Only rear wheels provide traction in snow- 4WD does not automatically engage as it should
Visitor, 2005 Saab 9-7x, 84,000 mi
NO traction at all in the snow/ice. It is supposed to engage when the back tires slip...only one of my tires is spinning.