2017 MITSUBISHI MIRAGE G4

Typical onset: 60,000-90,000 mi

Symptoms: Shuddering or hesitation during acceleration, Whining or grinding noises from transmission, CVT fluid burning smell, Sudden loss of power or limp mode, Check engine light with transmission codes

Fix: CVT oil cooler often fails first, causing fluid overheating and internal damage. If caught early, cooler replacement (2-3 hrs labor) may save the transmission. Once internal damage occurs, CVT replacement or rebuild needed (8-12 hrs labor). Used/rebuilt CVTs are common route due to new unit cost.

Estimated cost: $400-800 for cooler only, $3,500-5,500 for CVT replacement

Typical onset: 40,000-80,000 mi

Symptoms: Sudden loud knocking or rattling from engine, Metal shavings in oil during change, Severe oil consumption (quart per 500-1000 miles), Engine seized or won't turn over, Low oil pressure warning despite proper level

Fix: The 3B12 engine shows pattern of rod bearing and main bearing failures, often linked to inadequate oiling or cooling under sustained high load. Requires complete teardown: short block replacement, pistons, bearings, rings, often head work (25-35 hrs labor). Many owners opt for used engine swap instead due to vehicle value vs repair cost.

Estimated cost: $4,500-7,000 for rebuild, $2,500-4,000 for used engine swap

Typical onset: 50,000-90,000 mi

Symptoms: Excessive vibration at idle or during acceleration, Clunking when shifting from Park to Drive, Visible engine/transmission movement in bay, Increased cabin noise and harshness

Fix: Front transmission mount degrades prematurely, especially on CVT models. Rubber separates from metal housing. Straightforward replacement (1.5-2 hrs labor). OEM part quality better than aftermarket for longevity.

Estimated cost: $200-350

Typical onset: 70,000-110,000 mi

Symptoms: White residue or crust around head gasket perimeter, Slight coolant loss with no visible leaks, Occasional overheating in hot weather or hills, Sweet smell from engine bay, Oil looks milky if severe (coolant intrusion)

Fix: The 3-cylinder runs hot and head gaskets can weep externally or fail internally. If caught early with external seepage only, replacement prevents bigger issues (6-8 hrs labor). Check for warped head - machine work adds time and cost. Often combined with timing chain inspection while in there.

Estimated cost: $800-1,400

Symptoms: Hard starting or extended cranking, Rough idle and stumbling, Check engine light with lean codes, Fuel smell in cabin or around tank, Poor fuel economy suddenly worsening

Fix: Fuel filter clogs prematurely on some units, possibly due to tank rust or manufacturing debris. Filter is integrated into fuel pump assembly in-tank, requiring tank drop (2.5-3.5 hrs labor). Also see corroded fuel lines at tank connection points. Address both together if tank is already down.

Estimated cost: $350-650