2021 TOYOTA PROBOX

Typical onset: 80,000-140,000 mi

Symptoms: Delayed engagement when shifting to Drive or Reverse, Shuddering during acceleration especially uphill, Fluid burnt smell or dark brown color, Transmission overheating warning light

Fix: CVT fluid flush every 40k is critical but often skipped in fleet service. When cooler lines corrode (common in rust-belt climates), you're looking at cooler replacement plus full flush, 3-4 labor hours. If internal damage already occurred, CVT rebuild or replacement runs 12-16 hours.

Estimated cost: $600-1,200 for preventive flush and cooler; $3,500-5,500 for CVT rebuild

Typical onset: 90,000-130,000 mi

Symptoms: Clunking when shifting from Park to Drive, Excessive engine movement visible under hood during acceleration, Vibration through floorboard at idle, Gear lever feels loose or notchy

Fix: The front transmission mount wears faster due to CVT vibration characteristics and commercial loading patterns. Straightforward replacement takes 1.5-2 hours including alignment check. Often done with engine mounts simultaneously.

Estimated cost: $250-450

Typical onset: 120,000-180,000 mi

Symptoms: Ticking or tapping noise from cylinder head on cold start, Noise persists after engine reaches operating temperature, Loss of power or rough idle if severely worn, Check engine light with misfire codes P0301-P0304

Fix: The 1NZ-FE hydraulic lifters stick or wear when oil change intervals exceed 5k miles (common in fleet use). If caught early, engine flush and frequent oil changes may quiet them. Full lifter replacement requires head removal, resurface while it's off—10-12 hours total. Head gasket kit included in job.

Estimated cost: $1,800-2,800

Typical onset: 100,000-150,000 mi

Symptoms: Visible wobble on crankshaft pulley at idle, Squealing or chirping that changes with RPM, Serpentine belt walking off pulleys repeatedly, Rough vibration through entire vehicle

Fix: The outer ring separates from the hub as rubber deteriorates. If it fails completely, the loose pulley can damage the crankshaft nose and timing components. Replacement is 2-3 hours but critical to catch before catastrophic failure.

Estimated cost: $400-650

Typical onset: 150,000+ mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Oil cap shows milky residue, Overheating under load or gradual temperature creep

Fix: The 1NR-FE is generally reliable but overheating incidents (often from neglected coolant) lead to gasket failure. Requires head removal, resurface, new gasket set, timing components inspection—8-11 hours. Always pressure test cooling system after reassembly.

Estimated cost: $1,600-2,400

Typical onset: 60,000-100,000 mi

Symptoms: Hesitation or stumbling during acceleration, Engine stalling at idle or when coming to stops, Hard starting especially when fuel tank below 1/4, Loss of power under load

Fix: Toyota specs 'lifetime' filter but commercial/fleet use with questionable fuel quality means 60-80k replacement is wise. Filter is in-tank on this generation requiring tank drop—2.5-3 hours labor. Skip this and you risk fuel pump failure.

Estimated cost: $350-550