2022 TOYOTA PROBOX

Typical onset: 60,000-90,000 mi

Symptoms: clunking on acceleration or deceleration, excessive vibration at idle, shifter movement during throttle application, visible engine rocking

Fix: Replace transmission mount, often alongside engine mounts if similarly aged. 1.5-2 hours labor. Commercial use and frequent stop-and-go accelerates rubber degradation. Inspect all mounts simultaneously.

Estimated cost: $180-350

Typical onset: 100,000-150,000 mi

Symptoms: ticking or tapping from cylinder head on cold start, noise persists after warm-up in severe cases, slight loss of power, check engine light with misfire codes in advanced cases

Fix: Hydraulic lifters wear from inadequate oil changes or extended service intervals. Requires valve cover removal, lifter replacement (all 16), valve clearance verification. 4-6 hours labor. Oil change history critical—commercial fleets often skip intervals.

Estimated cost: $650-1,100

Typical onset: 120,000-180,000 mi

Symptoms: white smoke from exhaust, coolant loss with no external leaks, milky oil on dipstick, overheating under load, rough idle and misfires

Fix: The 1NZ-FE has thin head gasket material prone to failure after repeated overheating cycles. Requires head removal, resurfacing (flatness critical), new gasket kit, timing chain inspection. 8-12 hours labor depending on head condition. Always pressure-test and resurface the head—warping common.

Estimated cost: $1,800-2,800

Typical onset: 70,000-110,000 mi

Symptoms: red fluid spots under vehicle, low transmission fluid on dipstick, delayed engagement when cold, transmission overheat warning in severe cases

Fix: Metal cooler lines corrode where they pass through subframe brackets, especially in salt-belt regions. Replace both feed and return lines preventively. 2-3 hours labor including fluid refill and leak check. Inspect radiator-mounted cooler simultaneously.

Estimated cost: $350-550

Typical onset: 90,000-140,000 mi

Symptoms: belt squeal that won't resolve with tension adjustment, visible rubber separation between hub and outer ring, vibration at specific RPM ranges, serpentine belt walking off pulleys

Fix: Rubber damper layer delaminates from heat cycling and age. Requires balancer removal with puller, inspect timing cover seal while accessible. 2.5-3.5 hours labor. Failure can cause accessory belt loss and overheating—check during timing chain service.

Estimated cost: $400-650

Typical onset: 80,000-120,000 mi

Symptoms: hard starting after sitting, loss of power under acceleration, stumbling at highway speeds, surging idle, check engine light with lean codes

Fix: In-tank fuel pump filter clogs from poor fuel quality or tank sediment—common in commercial fleets using bulk fuel. Requires fuel tank drop, pump module removal, filter replacement. 2-3 hours labor. Replace entire pump assembly if unit has 100k+ miles.

Estimated cost: $300-600