Professional SCAN TEST will make short work of a positive repair solution!
Why guess at it?
During short test drive - scanner mph display can be compared to speedometer reading for positive identification of problem area..
Only way to go.
RepairPal Certified shops can diagnose and repair your 2006 Ford Taurus. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
IF scanner display is reading same as speedometer = mph *signal* malfunction. IF scanner display is actually reading mph = *speedometer* malfunction.