check engine light on, failed emissions test, could it be a vacuum leak? or???? on 2004 Buick Rendezvous

2004 buick rendezvous. it's not the gas cap, or pers sensor. would a vacuum leak make it fail emission test? what would a ballpark figure be for cost to fix. Could it be part of the recall??

by in Ware, MA on April 25, 2012
1 answer 1 comment
ANSWER by , April 25, 2012
several things will cause a failure. seek a diag from a good mech that has a smoke mach and good scan tools
COMMENT by , April 27, 2012
Thanks, I'm going to Autozone this morning to do the check and then to the mechanic. Thanks for your reply.