One problem related to strut failure has been reported for the 1998 Toyota Avalon. The most recently reported issues are listed below.
Front strut bracket failure causing front suspension noise, poor ride, and uneven tire wear. Previous TSB's were noted by owner. Problem fixed by dealer under extended warranty. I have concerns about this major component failure at relatively low mileage for suspension components and would have had to pay over $500 if not covered by extended warranty. Do to numerous complaints of this nature in Toyota cars, would think this is likely manufacturing or engineering defect and duty of Toyota to fix.