One problem related to steering idler arm has been reported for the 1999 Buick Century. The most recently reported issues are listed below.
Front right wheels of Buick Century make a clunking noise when making right turn. Had front strut e3850 also 22064745 w-strut & 908554 bearing replaced under warranty. Noise again developed shortly after. I notified Buick in their service questionaire that noise was back and I was not satisfied . Regan Buick service states they will have to charge me to fix it again as warranty is up. Service station says same problem in other cars of same make and model and is a defect.