RepairPal Certified shops can diagnose and repair your 2002 Mercury Sable. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
copy and paste the link.try this first.there is another way,but the intake has to come off.
http://ww2.justanswer.com/uploads/jmcdo28/2011-03-29_184952_pcv.pdf