There are 1 stored owner reports matching the engine leading-label group for the 2013 Lincoln Navigator in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 1 of 1 matching reports.
Open the full vehicle complaint log (all categories)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.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.