1997 LEXUS LS 400

Typical onset: 120,000-200,000 mi

Symptoms: Ticking or knocking from valve train especially when cold, Low oil pressure warning light, Metal shavings in oil or filter, Severe cases: spun bearings, seized engine

Fix: If caught early, aggressive flush and frequent oil changes (every 3k) may save it. Once bearings are damaged, you're looking at either a complete engine rebuild (40-60 hours) or short block replacement (30-40 hours). Many owners opt for low-mileage JDM replacement engines instead of rebuilding.

Estimated cost: $4,500-8,500

Typical onset: 80,000-150,000 mi

Symptoms: Pink or red fluid leaking near radiator, Transmission slipping or delayed engagement, Milky transmission fluid (worst case: coolant contamination), Overheating transmission

Fix: The metal cooler lines rust through where they connect to the radiator. Replace both lines and inspect radiator internal cooler for cross-contamination. If coolant mixed with ATF, transmission rebuild is mandatory (18-24 hours). Preventive line replacement is 2-3 hours.

Estimated cost: $400-800 (lines only), $2,800-4,200 (if transmission damaged)

Typical onset: 100,000-180,000 mi

Symptoms: Clunking over bumps from front suspension, Wandering or loose steering feel, Excessive tire wear on inside edge, Visible separation or torn boot on ball joint

Fix: Factory ball joints are pressed into the lower control arms and frequently separate catastrophically. Must replace entire lower control arm assembly on each side (ball joints not sold separately by Lexus). 3-4 hours labor per side, alignment required afterward.

Estimated cost: $800-1,400

Typical onset: 120,000-200,000 mi

Symptoms: Intermittent no-crank, especially when engine is hot, Single click when turning key, Eventually fails completely

Fix: The Denso starter hangs under the exhaust manifold and heat-soaks over time, wearing out the solenoid contacts. Replacement is straightforward but access is tight. 2-3 hours labor. Rebuild kits exist but most shops install a remanufactured unit.

Estimated cost: $450-750

Typical onset: 90,000 mi intervals

Symptoms: No symptoms until failure, If belt breaks: instant no-start, bent valves guaranteed (interference engine), Weeping coolant from water pump before failure

Fix: This is an interference engine — belt failure destroys valves. Factory interval is 90k but many techs recommend 60-70k on neglected cars. Full job includes belt, tensioner, idler pulleys, water pump, cam and crank seals. 6-8 hours labor. Skipping this service turns a $900 job into a $4,000+ valve job.

Estimated cost: $900-1,400

Typical onset: 100,000-150,000 mi

Symptoms: Clunk or jolt when shifting from Park to Drive/Reverse, Vibration at idle in gear, Visible sagging of engine or transmission

Fix: The hydraulic mounts leak and collapse. Transmission mount is the most common culprit (2 hours). Rear engine mount is labor-intensive (4-5 hours) but rarely needs replacement. Front mounts are easier (1.5 hours each).

Estimated cost: $350-600 (trans mount), $500-900 (rear engine mount)

Typical onset: 130,000-200,000 mi

Symptoms: Power steering fluid dripping from bellows boots, Groaning when turning at low speed, Needing to top off reservoir frequently

Fix: Internal seals wear and leak into the bellows. Some techs attempt bellows replacement (band-aid fix, 3 hours), but proper repair is rack replacement or rebuild. Rack replacement is 5-7 hours due to tight engine bay. Many owners live with minor seepage and just top off fluid.

Estimated cost: $1,200-2,000

Typical onset: 120,000-180,000 mi

Symptoms: Battery light illuminated, Dimming lights at idle, Voltage below 13.5V with engine running, Whining or grinding noise from alternator

Fix: Denso alternators are robust but eventually the voltage regulator or brushes fail. Replacement is accessible from top of engine bay. 1.5-2 hours labor. Remanufactured units are readily available.

Estimated cost: $400-650