The 2019 Navigator uses Ford's 3.5L EcoBoost twin-turbo V6 (450hp) in a luxury SUV package. While refined when running right, this platform suffers from catastrophic turbo V6 failures, transmission cooling issues, and expensive electronic glitches that can financially total an otherwise nice truck.
Catastrophic Engine Failure — Piston/Bearing/Ring Damage
Occasional · high severityTypical onset: 60,000-120,000 mi
Symptoms: Sudden knocking or ticking from engine bay, Metal shavings in oil, Check engine light with misfire codes, Loss of power or rough idle before total failure, Smoke from exhaust
Fix: This generation EcoBoost has documented issues with carbon buildup on intake valves causing pre-ignition and detonation, which destroys pistons, rings, and bearings. Also see rod bearing failures from oil starvation. Requires full engine rebuild or short-block replacement. 18-25 labor hours depending on route taken.
Estimated cost: $12,000-18,000
Transmission Oil Cooler Failure and Related Trans Damage
Common · high severityTypical onset: 50,000-90,000 mi
Symptoms: Transmission overheating warning, Harsh or delayed shifts, Limp mode activation, Coolant in transmission fluid or trans fluid in coolant, Transmission slipping
Fix: The 10-speed transmission oil cooler (integrated into radiator) fails internally, cross-contaminating coolant and ATF. This destroys the transmission if not caught early. Requires cooler replacement, complete fluid flush of both systems, and often transmission rebuild or replacement. 12-20 hours depending on trans condition.
Estimated cost: $3,500-9,500
Turbocharger Failure
Occasional · high severityTypical onset: 70,000-110,000 mi
Symptoms: Loud whining or grinding from engine bay, Blue smoke on acceleration, Loss of boost pressure, Check engine light with turbo underboost codes, Oil consumption increases
Fix: Twin turbos can fail from oil coking in the center bearings, especially if oil changes are stretched. Replacing both turbos with gaskets and related hardware. 10-14 labor hours, often done with other engine work.
Estimated cost: $4,500-7,000
Rear Air Suspension Failure
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Rear sags when parked overnight, Suspension fault warning on dash, Compressor runs constantly, Uneven ride height side-to-side, Clunking over bumps
Fix: Rear air springs develop leaks at the bellows or fittings, and the compressor wears out from overwork. Typical repair replaces both rear springs and compressor with dryer. 4-6 labor hours.
Estimated cost: $2,500-4,200
Backup Camera System Failure (Recall-Related)
Common · low severitySymptoms: Blank screen when shifting to reverse, Intermittent camera display, Distorted or frozen image, Delay in camera activation
Fix: NHTSA recall for backup camera but many units still fail outside recall scope. Typically requires camera module replacement and software update. 1.5-2 labor hours.
Estimated cost: $600-1,200
Instrument Cluster and Infotainment Glitches
Occasional · medium severitySymptoms: Cluster goes dark or freezes, SYNC system crashes or reboots randomly, Warning lights illuminate with no stored codes, Touchscreen unresponsive, Gauges read incorrectly
Fix: APIM (Accessory Protocol Interface Module) or cluster itself fails, often requiring module replacement and programming. Software updates sometimes help but hardware replacement common. 2-3 labor hours plus programming time.
Estimated cost: $1,500-3,000
Fuel System Issues — High-Pressure Pump and Injector Failures
Occasional · high severityTypical onset: 80,000-130,000 mi
Symptoms: Hard starting when engine hot, Rough idle and misfires, Loss of power under load, Check engine light with fuel trim or pressure codes, Engine stalls at idle
Fix: Direct-injection high-pressure fuel pump fails, or injectors clog from carbon. Pump replacement involves dropping fuel tank; injectors require intake manifold removal and often replacement of all six. 6-10 labor hours depending on scope.
Estimated cost: $2,000-4,500
Only buy with comprehensive warranty or if you can afford a $15k engine replacement as routine maintenance — these are financial hand grenades after 70k miles.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.