2020 FORD F-150 RAPTOR

Typical onset: 30,000-80,000 mi

Symptoms: Deep knocking noise from bottom end at idle or under load, Low oil pressure warning, Metal shavings in oil filter, Sudden loss of power, Check engine light with misfire codes

Fix: This is the big one. The Gen 2 3.5L EcoBoost HO suffers from rod bearing failures, often traced to inadequate oiling during high-RPM operation or sustained acceleration (desert running, towing uphill). Fixing it properly requires full engine teardown: rod bearings at minimum, but often you're looking at crankshaft polishing or replacement, and sometimes piston/ring damage from debris. Expect 25-35 hours of labor for a proper rebuild, or 18-22 hours for a Ford short block swap if the crank is toast.

Estimated cost: $8,000-15,000

Typical onset: 40,000-90,000 mi

Symptoms: Transmission fluid leak near front of vehicle, Burnt transmission fluid smell, Slipping or delayed shifts if fluid level drops, Puddle of red fluid under truck

Fix: The quick-connect fittings on the 10R80 transmission cooler lines crack or leak, especially after exposure to heat cycles and road salt. You're replacing the cooler lines themselves (some techs also do the external cooler if contamination is suspected). Ford revised the fittings on later builds, but 2020s see this regularly. 2-3 hours labor, plus fluid flush.

Estimated cost: $400-800

Typical onset: 50,000-100,000 mi

Symptoms: Clunking noise on hard acceleration or deceleration, Vibration felt through chassis at idle in gear, Excessive driveline movement visible during throttle blips

Fix: The rubber transmission mount fatigues from the torque pulses of the twin-turbo V6, especially with aggressive driving or off-road impacts. It's a straightforward swap: support the transmission, unbolt old mount, bolt in new. 1.5-2 hours labor. OEM Ford part recommended over aftermarket.

Estimated cost: $250-450

Typical onset: 50,000-100,000 mi

Symptoms: Consuming 1+ quart of oil every 1,000-2,000 miles, Blue smoke from exhaust on cold start or hard acceleration, Carbon buildup on spark plugs, Loss of power under boost

Fix: Some EcoBoost HO engines develop worn or stuck piston rings, leading to oil burning and blow-by. This often shows up before full bearing failure but can coexist. Diagnosis requires a leak-down test and borescope inspection. Fix is cylinder head removal and piston/ring replacement, sometimes full short block if cylinder walls are scored. 20-28 hours labor depending on whether you're doing rings only or full pistons and honing.

Estimated cost: $5,000-9,000

Typical onset: 60,000-120,000 mi

Symptoms: White smoke from exhaust (coolant burning), Overheating with no visible coolant leak, Bubbles in coolant reservoir, Misfire codes on multiple cylinders, Oil contamination in coolant or vice versa

Fix: Not as common as the bottom-end issues, but the EcoBoost HO can blow head gaskets if overheated or if the engine has seen sustained high boost. Both heads come off, gaskets replaced, heads checked for warping and resurfaced if needed. Timing chains and turbo seals often get done at the same time. 18-24 hours labor.

Estimated cost: $4,500-7,500

Typical onset: 80,000-120,000 mi

Symptoms: Hard starting, especially when hot, Hesitation or stumble under hard acceleration, Intermittent loss of power, Fuel pressure codes (P0087)

Fix: The high-pressure fuel filter on the Gen 2 EcoBoost can clog prematurely, especially with poor fuel quality or if the low-pressure pump is feeding debris. It's mounted on the driver-side frame rail. Straightforward replacement, but requires fuel system depressurization and you'll lose some fuel. 1-1.5 hours labor. Always replace the low-pressure in-tank filter at the same time if symptoms persist.

Estimated cost: $300-500