2012 TOYOTA SEQUOIA

Typical onset: 80,000-150,000 mi

Symptoms: Cold start knock or rattle that may disappear when warm, Progressive low-end engine noise (piston slap), Metal shavings in oil, eventual bearing failure, Check engine light with misfire codes in severe cases

Fix: Pistons in the 5.7L (3UR-FE) can develop cracked or worn skirts, causing slap and eventual connecting rod bearing damage. Requires complete engine rebuild or short block replacement. Budget 25-35 hours labor for in-frame rebuild, more for complete removal.

Estimated cost: $6,000-12,000

Typical onset: 60,000-120,000 mi

Symptoms: Transmission fluid leaking from cooler lines at radiator, Pink fluid pooling under vehicle, Transmission overheating, slipping, or delayed engagement, Coolant contamination with ATF (cross-contamination in radiator)

Fix: The transmission cooler lines rust and leak where they connect to the radiator, and the internal cooler can fail allowing coolant/ATF mixing. Replace cooler lines and external cooler (bypass internal if failed). Flush transmission and cooling system if cross-contamination occurred. 3-5 hours labor depending on contamination extent.

Estimated cost: $800-2,500

Typical onset: 90,000-140,000 mi

Symptoms: Check engine light with P0410, P0418, P0419 codes, Rough idle on cold start for first 30-60 seconds, Failed emissions test in states requiring it, Air pump grinding noise on cold start

Fix: Air injection pump, control valves, or check valves fail. Pump is the common culprit. Can delete system in non-emissions states or replace pump and valves. 2-4 hours labor for pump replacement.

Estimated cost: $800-1,400

Typical onset: 80,000-130,000 mi

Symptoms: Clunking or popping from front suspension over bumps, Wandering or loose steering feel, Uneven tire wear on inside edge, Play in wheel when rocked by hand with vehicle lifted

Fix: Factory ball joints are pressed into lower control arms and wear prematurely, especially with larger tires or heavy loads. Replace both lower control arms with assemblies (easier than pressing). 3-4 hours labor for both sides plus alignment.

Estimated cost: $800-1,200

Typical onset: 100,000-160,000 mi

Symptoms: Power steering fluid leak from rack boots or hoses, Whining or groaning when turning, Heavy steering effort when cold, Fluid dripping near inner tie rods or below steering column

Fix: Rack seals leak at the inner tie rod boots, and high-pressure hoses crack. Related to NHTSA recalls on earlier models. Replace rack or reseal (rack replacement more common). High-pressure hose alone is 1.5 hours; full rack is 4-6 hours labor.

Estimated cost: $400-2,000

Typical onset: 70,000-120,000 mi

Symptoms: Ticking or tapping from engine bay, worse on cold start, Exhaust smell in cabin with heat on, Visible soot around manifold-to-head interface, Slight power loss or rough idle

Fix: Exhaust manifold studs corrode and break, or gaskets fail causing leaks. More common on 4.6L. Requires manifold removal, stud extraction, and regasket. 4-7 hours labor per side if studs are broken (extraction time varies).

Estimated cost: $600-1,400

Typical onset: 80,000-150,000 mi

Symptoms: Gear oil dripping from front of rear differential, Oil residue on driveshaft near pinion yoke, Low differential fluid level on inspection, Whining noise from rear axle if run low on fluid

Fix: Pinion seal leaks due to age and heat cycles. Requires driveshaft removal, pinion nut torque spec critical to avoid bearing preload issues. 2-3 hours labor.

Estimated cost: $350-600