1998 LEXUS LS 400

Typical onset: 120,000-200,000 mi

Symptoms: Ticking or knocking from lower end, especially cold start, Metal shavings in oil or oil filter, Sudden loss of oil pressure, Seized engine after overheat or prolonged neglect

Fix: Toyota 1UZ-FE engines from this era are sludge-prone if owners skipped oil changes or used incorrect oil weight. Sludge blocks oil passages, starves rod/main bearings, and destroys the bottom end. Requires complete engine rebuild (pistons, rings, bearings, machine work) or used/reman engine swap. Rebuild: 25-35 hours labor. Swap: 18-24 hours.

Estimated cost: $4,500-8,000

Typical onset: 100,000-180,000 mi

Symptoms: Pink fluid leak from radiator area or under transmission, Transmission slipping or delayed shifts, Milky pink transmission fluid (coolant contamination), Overheating transmission

Fix: Steel cooler lines rust through at unions or where they attach to the radiator. When they burst, ATF mixes with coolant and contaminates the transmission. If caught early (external leak only), replace lines and flush both systems. If coolant entered transmission, full trans rebuild or replacement required. Lines alone: 2-3 hours. Trans rebuild after contamination: 12-18 hours.

Estimated cost: $300-500 (lines only), $3,000-5,500 (trans rebuild)

Typical onset: 80,000-150,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Vibration at idle in gear, Driveline shudder during acceleration, Excessive drivetrain movement visible under hood during shifts

Fix: Rubber transmission mount deteriorates and separates. Causes harsh shift feel and drivetrain movement. Requires lift, support transmission with jack, unbolt old mount, install new. Often done with engine mounts at same time. 2-3 hours labor for trans mount alone.

Estimated cost: $350-600

Typical onset: 150,000-250,000 mi

Symptoms: Single click or no sound when key turned, Intermittent no-start, works after sitting or tapping starter, Grinding noise during cranking, Slow cranking even with new battery

Fix: Denso starters are reliable but eventually wear out solenoid contacts or bushings. Access is tight on V8—requires removing intake components or working from underneath. 2.5-4 hours labor depending on approach. Use OEM or quality reman; cheap aftermarket starters fail quickly.

Estimated cost: $500-900

Typical onset: 120,000-200,000 mi

Symptoms: Whining noise on cold starts or during turns, Fluid leak from pump or high-pressure hose, Heavy steering or intermittent assist loss, Low fluid level requiring frequent top-ups

Fix: Pump seals leak, or high-pressure hose weeps at crimps. Pump replacement: 2-3 hours. If just hoses, 1.5-2 hours. Flush system after repair to clear debris. OEM pumps preferred—rebuilds often whine prematurely.

Estimated cost: $400-750

Typical onset: 120,000-180,000 mi

Symptoms: Battery warning light illuminated, Dimming headlights or interior lights at idle, Battery repeatedly dies or won't hold charge, Whirring or grinding noise from alternator pulley

Fix: Denso alternators last well but eventually fail (diodes, voltage regulator, bearings). Relatively easy access on passenger side of engine. 1.5-2.5 hours labor. Test battery and charging system before replacing—bad battery often misdiagnosed as alternator.

Estimated cost: $450-750

Typical onset: 100,000-160,000 mi

Symptoms: Clunking over bumps from front suspension, Wandering or loose steering feel, Tire wear on inner or outer edges, Play or looseness when prying on control arm during inspection

Fix: Lower ball joints wear and develop slop. Not serviceable separately—requires entire lower control arm replacement. Both sides: 3-4 hours labor plus alignment. Do both at once to save labor overlap.

Estimated cost: $700-1,200 (both sides)