1996 TOYOTA PREVIA

Typical onset: 90,000-150,000 mi

Symptoms: Whining or grinding noise from supercharger under acceleration, Loss of power above 3,000 RPM, Metal shavings in SC oil reservoir, Check engine light with boost-related codes

Fix: The SC oil feed system clogs or the internal oil pump fails, starving bearings. Requires SC rebuild or replacement (6-8 hours labor due to mid-engine location under cowl). Many techs replace with reman unit. If caught early, just oil system service and bearing replacement; if delayed, housing damage requires full SC replacement.

Estimated cost: $1,800-3,500

Typical onset: 120,000-180,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Overheating under load, Milky oil on dipstick or cap, Rough idle when cold

Fix: Supercharger heat and Toyota's marginal OEM gasket design cause failures on both cylinder banks. The mid-engine layout makes this a 20-25 hour job minimum. Once heads are off, most find worn rings, scored cylinders, or bearing wear from coolant contamination, turning it into a full rebuild with machine work, pistons, bearings, and rings. Some shops recommend short-block replacement instead.

Estimated cost: $4,500-7,500

Typical onset: 80,000-140,000 mi

Symptoms: ATF puddles under vehicle near radiator, Low transmission fluid warnings or slipping, Pink residue on radiator or cooler lines, Burnt ATF smell after highway driving

Fix: Steel cooler lines rust through where they run along the frame rails, especially in salt-belt states. Lines are NLA from Toyota, so most techs fabricate custom stainless lines or use universal transmission cooler kits with remote cooler (4-6 hours). If leak goes unnoticed, transmission starves and fails—add $2,500-4,000 for rebuild.

Estimated cost: $600-1,200

Typical onset: 100,000-160,000 mi

Symptoms: Clunking when shifting from Park to Drive, Excessive vibration at idle, Transmission appears to 'drop' or shift position when accelerating, Visible cracks or separation in rubber mount

Fix: The rear transmission mount (part of the mid-engine cradle) collapses from age and heat exposure. Replacement requires supporting the drivetrain from below and accessing mount bolts from inside the vehicle through carpet access panels (3-4 hours). Aftermarket replacements available but OEM lasts longer.

Estimated cost: $400-700

Typical onset: 100,000+ mi

Symptoms: Hard starting when hot, Loss of power on hills or at highway speeds, Engine stumbling or surging under load, Stalling after 20-30 minutes of driving

Fix: The in-tank fuel pump screen and inline filter clog from sediment in aging tanks. Inline filter is easy (0.5 hours), but if tank screen is clogged, requires fuel tank drop and pump assembly service (4-5 hours). Many techs recommend full pump assembly replacement at this age given labor involved.

Estimated cost: $300-900

Typical onset: 150,000-200,000 mi

Symptoms: Knocking noise from lower engine that increases with RPM, Low oil pressure at idle when hot, Metallic ticking that worsens under load, Metal flakes in oil filter during changes

Fix: Owners who skip oil changes or run low on oil (common with SC oil consumption) wear rod and main bearings prematurely. Diagnosis requires oil pressure test and sometimes bearing inspection. If caught early, just bearing replacement with crank polish (12-15 hours). If crank is scored, needs grinding or replacement, pushing into full rebuild territory.

Estimated cost: $2,200-5,000