Two problems related to speed sensor have been reported for the 2008 Toyota Scion Xb. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Scion Xb based on all problems reported for the 2008 Scion Xb.
At just over 38,000 miles the brake, abs, traction control, and vsc lights all illuminated on my dash. From what I have read it is most likely the rear speed sensors but also requires hundred of dollars worth of other parts to replace. I looked on many of the Scion Xb forums and found many many people with the same problem. Since I have owned this car(from new) it has been a pain. I have had to replace the O2 sensor the clutch master cylinder the rear brake pads and the low wheel pressure light goes on when it is cold or wet out. So much for Toyota reliability. I owned a 1985 Toyota celica that had 185000 miles on it when I bought it drove it for 3 years and put on an additional 100000 miles myself and all I had to replace was an alternator belt. So why am I having so many problems with a car that is 23 years newer. I have also received a recall for the ignition coils. Seems to me as though all of us that own theses xb's have been suckered into buying lemons.
Abs system / vehicle stability control system failure. Faulty speed sensors, harness, and wires / both left and right sides. Defect results in permanent loss of abs braking and vsc control systems.