2016 FIAT 500L

Typical onset: 60,000-100,000 mi

Symptoms: Metallic knocking or rattling from engine, Excessive oil consumption (quart every 500-1,000 mi), White or blue smoke from exhaust, Check engine light with misfire codes, Catastrophic loss of power or sudden seizure

Fix: Complete engine rebuild or short block replacement required. Typically involves pistons, rings, bearings (main and rod), sometimes crankshaft machining or replacement. 18-25 labor hours depending on extent of damage and whether heads need work. Many shops recommend used/reman long block instead of piecing together a rebuild.

Estimated cost: $4,500-8,000

Typical onset: 50,000-90,000 mi

Symptoms: Transmission fluid leaking from cooler area, Harsh or delayed shifts, Transmission overheating warning, Shuddering during acceleration, Limp mode activation in hot weather or traffic

Fix: Replace transmission oil cooler and flush contaminated fluid. Often the cooler develops internal leaks that mix coolant and trans fluid, requiring additional cooling system service. 3-5 hours labor depending on accessibility.

Estimated cost: $800-1,400

Typical onset: 40,000-80,000 mi

Symptoms: Excessive vibration at idle, Clunking when shifting from Park to Drive, Engine rocks noticeably during acceleration, Transmission feels like it's hitting something during hard shifts

Fix: Replace failed transmission mount. The rubber deteriorates prematurely on these. 1.5-2.5 hours labor. Often found during inspection for other complaints.

Estimated cost: $250-450

Typical onset: 70,000-110,000 mi

Symptoms: Coolant loss with no visible external leaks, White exhaust smoke, Overheating in traffic, Oil contaminated with coolant (milky appearance), Bubbles in coolant reservoir when running

Fix: Replace both head gaskets, resurface head(s) if warped, flush cooling system. Often discovered during diagnosis of overheating or after engine damage has already occurred. 12-16 hours labor. Frequently accompanies or precedes complete engine failure if not caught early.

Estimated cost: $2,800-4,200

Symptoms: Hard starting or extended cranking, Rough idle and hesitation, Loss of power under load, Check engine light with fuel trim codes, Stalling after fueling

Fix: Replace fuel filter and sometimes in-tank fuel pump/sender assembly if contaminated. Filter isn't a traditional service item but clogs prematurely on these. 1.5-3 hours labor depending on whether tank needs dropping.

Estimated cost: $300-700

Typical onset: 80,000-120,000 mi

Symptoms: Rough idle with misfires, Check engine light with cam/crank correlation codes, Ticking or tapping from cylinder head, Poor fuel economy, Loss of power especially on cold starts

Fix: MultiAir electro-hydraulic valve actuation system failure requiring cylinder head removal and replacement of actuators, solenoids, or entire head assembly. Often discovered after misdiagnosis as spark plugs or coils. 10-14 hours labor minimum.

Estimated cost: $3,000-5,500