The 2001 Sequoia shares the proven Tundra platform with a solid 2UZ-FE V8, but this first model year suffers from a catastrophic engine defect and some transmission cooling issues that can end the truck prematurely if not caught early.
2UZ-FE Lower Engine Failure (Piston Ring / Bearing Collapse)
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: Excessive oil consumption (1+ quart per 1,000 miles), Blue smoke on startup or acceleration, Metallic knocking noise from lower end, especially when cold, Sudden loss of oil pressure and engine seizure in worst cases
Fix: Complete lower-end rebuild or short-block replacement required. 18-25 labor hours depending on shop efficiency and whether you pull the engine. Piston rings, main bearings, rod bearings, and sometimes pistons all need replacement. This is an engine-out job at most shops.
Estimated cost: $4,500-7,500
Transmission Oil Cooler Line Failure / Internal Cooler Clog
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Pink milkshake in radiator overflow (coolant/ATF mixing), Transmission overheating and slipping, Hard or delayed shifts after cooler contamination, Sudden transmission failure if driven after fluid cross-contamination
Fix: Replace radiator (internal cooler cannot be cleaned once contaminated), flush transmission multiple times, replace transmission filter, inspect for internal trans damage. If caught late, transmission rebuild needed. 6-8 hours labor for radiator/flush; add 12-18 hours if trans needs rebuild.
Estimated cost: $1,200-2,000 (cooler/flush only); $3,500-5,000 (if trans damaged)
Transmission Mount Deterioration
Common · low severityTypical onset: 90,000-150,000 mi
Symptoms: Clunk on acceleration or deceleration, Vibration at idle in Drive, Excessive driveline movement visible under throttle changes
Fix: Replace rear transmission mount (engine side less common but check both). 1.5-2.5 hours labor. Rubber deteriorates from heat and age.
Estimated cost: $250-450
Secondary Air Injection (AIR) System Failures
Occasional · low severityTypical onset: 100,000-160,000 mi
Symptoms: Check engine light with P0410, P0441, or P0446 codes, Rattling noise from front of engine on cold start (AIR pump), Failed emissions testing in states that require it
Fix: AIR pump, control valve, or vacuum switching valve replacement. 2-3 hours labor. Many owners delete the system in non-emissions states, but that creates permanent CEL.
Estimated cost: $400-800
Lower Ball Joint Wear
Common · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Clunking over bumps from front suspension, Wandering or loose steering feel, Uneven tire wear on inside edge, Play visible when prying on suspension during inspection
Fix: Replace lower ball joints (both sides recommended). Some aftermarket joints are greaseable. 3-4 hours labor for both sides including alignment.
Estimated cost: $600-1,000
Exhaust Manifold Cracking / Stud Failure
Occasional · low severityTypical onset: 120,000+ mi
Symptoms: Ticking noise from engine bay that increases with RPM, Exhaust smell in cabin or under hood, Visible soot streaks on manifold
Fix: Replace cracked manifold and drill out broken studs. 4-6 hours labor per side. Left side (driver) more common due to heat and tighter access.
Estimated cost: $800-1,400 per side
A capable, spacious truck with one fatal flaw: the early 2UZ engine grenades itself, and the trans cooler will take out the transmission if ignored—buy only with full service records and a pre-purchase inspection focused on oil consumption and fluid condition.
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.