There are 1 owner-reported engine complaints for the 2013 Lincoln Navigatorin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
While driving at approximately 65-70 mph on a major interstate, the engine experienced a sudden catastrophic failure without warning. This caused an immediate loss of power and power steering/braking assist, making the vehicle extremely difficult to control in high speed traffic. This sudden stall endangered my life and the lives of nearby motorists. A certified mechanic inspected the engine internals (via borescope) and identified that a valve seat had dropped in the #4 cylinder, causing it to impact and destroy the piston. This 'dropped valve seat' failure is a known defect in Ford/Lincoln 5.4L engines. It occurred despite my meticulous maintenance history and constitutes a latent manufacturing defect that creates an unreasonable safety risk on public highways.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026