2000 TOYOTA AVALON

Typical onset: 80,000-150,000 mi

Symptoms: Check engine light with low oil pressure codes, Knocking or ticking from cylinder heads, Burning oil consumption (1+ quart per 1,000 miles), Thick sludge visible under oil cap or on valve covers, Complete engine seizure in severe cases

Fix: If caught early, aggressive engine flush and shortened oil change intervals (3k miles) may save it. Once internal damage occurs, options are used/remanufactured engine swap (12-16 labor hours) or full engine rebuild with new pistons, rings, bearings, gaskets (25-35 hours). Toyota had a limited warranty extension that's long expired.

Estimated cost: $3,500-7,500

Typical onset: 100,000-180,000 mi

Symptoms: Transmission fluid leaking near radiator area, Pink or red fluid dripping under front of vehicle, Transmission slipping or delayed engagement if fluid level drops, Overheating transmission in hot weather or towing

Fix: Replace both metal cooler lines from transmission to radiator, plus fresh ATM fluid. Lines rust through where they attach to radiator or at crimped fittings. 2-3 labor hours. OEM lines preferred over aftermarket which can leak at crimps.

Estimated cost: $350-600

Typical onset: 120,000-200,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Excessive vibration at idle in Drive, Visible engine movement when revving in Park, Torque steer or pulling under hard acceleration

Fix: Replace front and rear transmission mounts (rear mount is the usual culprit). Hydraulic fluid inside mount leaks out, rubber deteriorates. 2-3 hours with proper support fixtures. While you're in there, inspect engine mounts too—often worn at this age.

Estimated cost: $400-700

Typical onset: 100,000-160,000 mi

Symptoms: Clunking over bumps from front suspension, Wandering or loose steering feel, Uneven tire wear on inside or outside edges, Steering wheel off-center after hitting potholes

Fix: Lower control arms usually replaced as assemblies (ball joint not serviceable separately on most aftermarket parts). If caught early, just ball joints can be pressed in. Plan on alignment after. 3-4 hours for both sides with alignment.

Estimated cost: $600-1,000

Typical onset: 120,000-180,000 mi

Symptoms: Single click when turning key, no crank, Intermittent no-start, works after sitting or cooling down, Grinding noise during start attempt (bendix gear worn), Slow cranking even with good battery

Fix: Denso starters are reliable but heat-soak from being mounted near exhaust takes its toll. Replacement is straightforward from top on this engine. 1.5-2 hours. Remanufactured units are fine—test battery and cables first to rule out electrical issues.

Estimated cost: $350-550

Typical onset: 90,000-150,000 mi

Symptoms: Clunking or popping from rear when going over bumps, Creaking noise when rocking vehicle side-to-side, Noise more noticeable in cold weather, No effect on handling or safety

Fix: Upper strut mount bearings wear out, allowing metal-on-metal contact. Replace strut mounts (both sides recommended). If struts are original, replace those too at this mileage. 3-4 hours for rear struts and mounts as a set.

Estimated cost: $600-900

Typical onset: 140,000-200,000 mi

Symptoms: Whining noise that changes with steering wheel movement, Groaning when turning at low speeds (parking lots), Power steering fluid leak from pump or high-pressure line, Stiff steering if fluid runs low

Fix: Pump seals leak or internal vanes wear. Replacement pump is 2-3 hours, includes fluid flush. Check high-pressure line for cracks at crimps—these fail too and are cheaper to replace than pump. Use OE-spec fluid (ATF Type T-IV), not universal PS fluid.

Estimated cost: $400-650