2019 TOYOTA PROBOX

Typical onset: 80,000-140,000 mi

Symptoms: Cold-start ticking that persists after warm-up, Progressively louder valve clatter, Loss of power under load, Check engine light with misfire codes

Fix: The 1NZ-FE hydraulic lifters wear from contaminated oil or extended service intervals common in commercial fleets. Replacing all lifters requires cylinder head removal. Budget 8-10 hours labor for head R&R, lifter replacement, and valve adjustment. If the camshaft lobes show scoring, add another $400-600 for a new cam.

Estimated cost: $1,200-2,000

Typical onset: 60,000-100,000 mi

Symptoms: Excessive vibration at idle in Drive, Clunking when shifting into gear, Engine rocks noticeably during acceleration, Visible sagging or torn rubber on mount inspection

Fix: The front and rear transmission mounts deteriorate quickly under constant stop-and-go delivery use. The front mount is accessible from above, rear requires subframe support. Each mount is 1.5-2 hours labor. Replace both at once to avoid comeback issues.

Estimated cost: $350-650

Typical onset: 90,000-130,000 mi

Symptoms: Shuddering during acceleration from 20-40 mph, Transmission slipping under load, Burning smell from transmission area, Transmission overtemp warning light

Fix: Some Probox CVTs experience belt slip from degraded fluid or clogged oil cooler passages. Start with a complete fluid exchange using genuine Toyota CVT fluid (NOT compatible with aftermarket). If shudder persists, the transmission oil cooler often has internal restriction requiring replacement (3-4 hours). Total CVT replacement runs 12-15 hours if internal damage has occurred.

Estimated cost: $400-800 for fluid/cooler, $3,500-5,000 for CVT replacement

Typical onset: 100,000-150,000 mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Oil cap shows milky residue, Overheating under load, Bubbles in coolant reservoir when running

Fix: The 1NR-FE can develop head gasket leaks between cylinders 2-3 from thermal cycling. Requires head removal, resurfacing, and new gasket. Always check head for warpage—if beyond spec, factor in $200-300 for machine shop resurfacing. Total job is 10-12 hours including timing chain work and coolant system flush.

Estimated cost: $1,800-2,800

Typical onset: 120,000-160,000 mi

Symptoms: Visible rubber separation between inner hub and outer ring, Squealing from front of engine, Rough idle with unusual vibration, Serpentine belt walking off pulleys

Fix: The rubber damper layer delaminates over time, particularly in hot climates. The balancer can separate catastrophically and damage the crank snout or timing cover. Replacement requires serpentine belt removal and careful extraction with a puller (2-3 hours). New OEM balancer plus installation.

Estimated cost: $400-650

Typical onset: 50,000-80,000 mi intervals

Symptoms: Hard starting after sitting overnight, Hesitation during acceleration, Stalling at idle, Reduced fuel economy

Fix: Many Probox units see questionable fuel quality in commercial service. The in-tank filter isn't regularly serviced by fleets. Requires fuel tank drop or access panel removal depending on model year. Budget 2-3 hours labor. Replace both in-tank strainer and inline filter if equipped.

Estimated cost: $250-450