2018 TOYOTA PROBOX

Typical onset: 50,000-90,000 mi

Symptoms: Clunk when shifting from Park to Drive, Excessive engine movement visible under hood during acceleration, Vibration at idle that changes when shifting to Drive/Reverse, Transmission noise amplified through cabin

Fix: Replace both engine and transmission mounts as a set — the front engine mount typically fails first but the trans mount follows within 10k-20k miles. 2.5-3.5 hours labor for both mounts. Commercial use with frequent stop-and-go accelerates rubber degradation.

Estimated cost: $350-600

Typical onset: 80,000-130,000 mi

Symptoms: Pink or red fluid pooling under vehicle near front-center, Transmission slipping or hesitation during acceleration, CVT overheating warning light, Burnt transmission fluid smell

Fix: External CVT cooler develops pinhole leaks at crimp joints or corroded lines. Requires cooler replacement plus full CVT fluid flush (4-5 liters Toyota CVT-FE fluid). If caught early, no internal damage. If run low on fluid, CVT chain damage occurs requiring full transmission replacement. 3-4 hours labor for cooler and flush.

Estimated cost: $800-1,200

Typical onset: 100,000-150,000 mi

Symptoms: Ticking or tapping noise from top of engine, worse on cold start, Noise subsides slightly after warm-up but never fully goes away, Check Engine light with P0300-P0304 misfire codes in severe cases, Loss of power at highway speeds

Fix: Hydraulic lifters wear from sludge buildup — endemic to 1NZ engines with extended oil change intervals. Requires valve cover removal, all 16 lifters replacement, and camshaft inspection for scoring. If camshaft shows wear, add 2 hours and $400-600 for cam replacement. Total job is 5-7 hours. Use only Toyota 0W-20 oil moving forward with 5k mile intervals.

Estimated cost: $1,200-2,000

Typical onset: 120,000-180,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible external leaks, Bubbles in coolant reservoir when engine running, Milky oil on dipstick or oil cap, Overheating under load

Fix: 1NR-FE develops head gasket leaks between cylinders 2-3 or into coolant passages. Requires head removal, surface inspection (often needs $150-250 machine shop resurfacing), new head gasket set, timing chain verification. If head is warped beyond spec, replacement head adds $600-900. 8-10 hours labor. Always replace thermostat and water pump during this job.

Estimated cost: $2,200-3,500

Typical onset: 130,000-170,000 mi

Symptoms: Visible wobble on crankshaft pulley at idle, Severe vibration that worsens with RPM, Squealing serpentine belt that cannot be tensioned properly, Check Engine light with crankshaft position sensor codes P0335/P0339

Fix: Rubber ring inside harmonic balancer deteriorates, allowing outer ring to separate. If it fully fails while driving, the serpentine belt shreds and the engine overheats immediately. Replacement requires special puller tool and installation tool to avoid crankshaft damage. 2-3 hours labor. Always inspect when doing timing-related work.

Estimated cost: $450-700

Typical onset: 60,000-100,000 mi

Symptoms: Hard starting especially when fuel tank below 1/4, Hesitation or stumble during acceleration, Loss of power uphill or under load, Check Engine light with lean codes P0171/P0174

Fix: In-tank fuel filter screens clog faster on commercial Proboxes running cheap fuel or operating in dusty environments. Requires fuel tank drop to access pump assembly. Replace entire pump/filter module rather than trying to clean — cleaning rarely lasts. 2-2.5 hours labor.

Estimated cost: $400-650