2013 LINCOLN NAVIGATOR

Typical onset: 80,000-150,000 mi

Symptoms: Cold-start rattle lasting 3-10 seconds, Check engine light with cam position codes P0340-P0349, Rough idle and hesitation on acceleration, Metallic rattling from front of engine

Fix: Requires both cam phasers, timing chains, guides, tensioners, and variable valve timing solenoids. Engine front disassembly necessary. 12-16 labor hours at independent shop rates. Often find stretched chains and worn guides together.

Estimated cost: $2,800-4,500

Typical onset: 60,000-120,000 mi

Symptoms: Sudden misfire with loud popping or hissing noise, Loss of power, Check engine light with misfire codes P0300-P0308, Visible spark plug threads damaged or plug blown out

Fix: The 2-valve and 3-valve 5.4L have inadequate spark plug thread engagement. When plugs blow out, HeliCoil or TimeSert thread repair required. If head damage is severe, complete cylinder head removal and machining needed. 3-8 hours depending on severity.

Estimated cost: $800-3,200

Typical onset: 100,000-180,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Rough running or misfire when cold, Milky oil or oil in coolant reservoir, Overheating

Fix: This engine can crack heads between valves or blow head gaskets, often from overheating events or cam phaser-related oil starvation. Requires both head gaskets, machining, and frequently new heads. If coolant entered cylinders and engine ran, piston/ring damage is common requiring short block. 20-35 hours for heads; 40+ for short block.

Estimated cost: $4,500-9,500

Typical onset: 70,000-130,000 mi

Symptoms: Transmission fluid leaking near radiator, Low transmission fluid warning, Slipping or delayed shifts, Pink fluid pooling under front of vehicle

Fix: The 6R80 transmission cooler lines corrode where they connect to the radiator. Simple line replacement if caught early. If transmission ran low on fluid, internal damage likely requiring rebuild. Lines alone: 1.5-2.5 hours.

Estimated cost: $300-600

Typical onset: 90,000-160,000 mi

Symptoms: No-start or extended cranking, Intermittent stalling, Loss of power under load, Fuel pump not priming when key turned on

Fix: Module mounted on frame rail near fuel tank fails from heat and corrosion. Replacement is straightforward but requires accessing frame-mounted component. 1-2 hours labor.

Estimated cost: $350-650

Typical onset: 80,000-140,000 mi

Symptoms: Vehicle sagging on one or both front corners overnight, Compressor running excessively, Ride height warning light, Rough ride quality

Fix: Air springs develop cracks and leaks. Can replace with OEM air springs (2-3 hours per side) or convert to traditional coil springs with conversion kit (4-6 hours both sides). Many owners opt for coil conversion for long-term reliability.

Estimated cost: $800-1,800

Typical onset: 70,000-150,000 mi

Symptoms: Gear oil dripping from front of rear differential, Low oil level in differential, Whining noise from rear end if run low

Fix: Pinion seal deteriorates and leaks. Requires driveshaft removal and seal replacement. If caught early, straightforward repair. 2-3 hours labor.

Estimated cost: $400-700