Some of the spark plugs are more easily accessible - it depends upon which one and how much time it takes to complete the repair.
Each situation is unique - - prices will vary by location and repair facility..
*Hands-on* evaluation will be required.
RepairPal Certified shops can diagnose and repair your 2008 Lincoln Navigator. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.