2002 MITSUBISHI MONTERO SPORT

Typical onset: 80,000-140,000 mi

Symptoms: Loud knocking noise from lower engine on cold starts or under load, Metal shavings in oil during changes, Sudden loss of oil pressure, Catastrophic failure with rod punching through block

Fix: The 6G72 3.0L V6 suffers from inadequate oiling to rod bearings, especially cylinder #6. Once knocking starts, it's too late—requires full engine rebuild or replacement. Rebuild involves complete teardown, new pistons, rings, bearings, machining crank and block. Typical shop time: 18-24 hours labor plus machine work.

Estimated cost: $3,500-6,000

Typical onset: 70,000-120,000 mi

Symptoms: Red transmission fluid pooling under vehicle, Transmission overheating warning, Harsh shifting or slipping after fluid loss, Lines corroded or leaking at crimped connections

Fix: Steel cooler lines rust through where they crimp to rubber sections near radiator. When they fail, transmission loses all fluid rapidly. Requires replacement of both feed and return lines, transmission fluid flush, often need radiator-mounted cooler inspection. 2-3 hours labor if caught early; if driven after leak, transmission rebuild adds $2,000+.

Estimated cost: $300-600

Typical onset: 90,000-150,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible leaks, Oil contaminated with milky residue, Overheating under load, Rough idle and misfire codes

Fix: Both V6 engines prone to head gasket failure, often on both banks due to cooling system design. Requires cylinder head removal both sides, machining heads for flatness, new gaskets, timing belt replacement while apart (it's due anyway). 14-18 hours labor.

Estimated cost: $2,200-3,500

Typical onset: 60,000-100,000 mi

Symptoms: Gear oil dripping from rear of driveshaft, Whining noise from rear axle when low on fluid, Visible oil coating rear differential housing

Fix: Pinion seal fails due to age and heat cycles. Requires driveshaft removal, seal replacement, bearing preload reset, and differential fluid refill. 2-3 hours labor. If driven low on fluid, can damage ring and pinion requiring full diff overhaul.

Estimated cost: $300-500

Typical onset: 80,000-130,000 mi

Symptoms: Flashing 4WD indicator light, Unable to engage or disengage 4WD, Grinding noise when attempting to shift into 4WD, Stuck in 2WD or 4WD mode

Fix: Electronic shift motor on transfer case fails, preventing mode changes. Requires replacement of actuator motor assembly. Access is awkward under vehicle. 2-3 hours labor.

Estimated cost: $400-700

Typical onset: 70,000-110,000 mi

Symptoms: Clunking over bumps, Wandering steering, Uneven tire wear on inside edges, Excessive play when checking wheel at 6 and 12 o'clock

Fix: Front lower ball joints wear out and cannot be replaced separately—requires entire lower control arm assembly both sides. Alignment mandatory after replacement. 3-4 hours labor for both sides.

Estimated cost: $600-900

Typical onset: 100,000-160,000 mi

Symptoms: No-start condition with crank but no fire, Stalling at idle or under acceleration, Loss of power on highway, Whining noise from fuel tank before failure

Fix: In-tank fuel pump fails, requires tank drop and pump module replacement. 3-4 hours labor. Fuel tank often corroded, making removal difficult.

Estimated cost: $500-800