2023 MITSUBISHI MIRAGE G4

Typical onset: 60,000-90,000 mi

Symptoms: Transmission fluid smells burnt or appears dark brown, Shuddering or hesitation during acceleration, CVT overheat warning light on dash, Loss of power under load or on hills

Fix: CVT oil cooler can clog or leak, leading to overheating. Requires cooler replacement, full CVT fluid flush, and sometimes external cooler lines. Plan on 3-4 hours labor. If caught late, internal CVT damage may require full transmission replacement.

Estimated cost: $800-1,500 for cooler and fluid; $3,500-5,000 if CVT is damaged

Typical onset: 80,000-120,000 mi

Symptoms: Rattling or knocking noise from engine on cold start or acceleration, Low oil pressure warning light, Excessive oil consumption between changes, Blue smoke from exhaust under load

Fix: The 1.2L 3-cylinder is sensitive to oil quality and change intervals. Extended oil changes or low-quality oil lead to piston ring wear, scored cylinder walls, and bearing damage. Fix requires engine rebuild with new pistons, rings, bearings, and often crank polishing or replacement. 12-16 hours labor for a full rebuild; short block swap if crank is damaged.

Estimated cost: $3,000-5,500 for rebuild; $4,500-7,000 for short block replacement

Typical onset: 50,000-80,000 mi

Symptoms: Excessive vibration or clunking when shifting from Park to Drive, Engine rocks noticeably during acceleration or braking, Harsh engagement into gear, Visible tearing or separation of rubber mount

Fix: The CVT transmission mount wears faster than expected, especially with spirited driving or heavy loads. Rubber separates from metal brackets. Replacement is straightforward but requires supporting the transmission. 1.5-2 hours labor.

Estimated cost: $250-450

Typical onset: 70,000-110,000 mi

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

Fix: Head gasket failure typically stems from cooling system neglect or overheating events. The 1.2L has a thin head design. Requires head removal, resurfacing, and new gasket set. Often find warped head. 8-10 hours labor; add time if head needs machine work.

Estimated cost: $1,800-3,200

Typical onset: 80,000-120,000 mi

Symptoms: Hesitation or stumbling during acceleration, Engine sputters or cuts out at highway speeds, Difficulty starting, especially when fuel tank is low, Check engine light with lean fuel mixture codes

Fix: In-tank fuel filter isn't a scheduled maintenance item in the manual, but contaminated fuel or long intervals cause clogging. Requires dropping the fuel tank to access the pump/filter assembly. 2-3 hours labor.

Estimated cost: $350-600

Typical onset: 90,000-130,000 mi

Symptoms: Loud knocking noise that increases with RPM, Sudden loss of power, Metal shavings in oil during change, Engine seizes or won't crank

Fix: Rod bearings fail when oil changes are skipped or wrong viscosity is used. The 1.2L runs high RPM for its size, stressing bearings. If caught early, can replace bearings and polish crank journals (10-12 hours). If rod throws through block, engine replacement required.

Estimated cost: $2,500-4,000 for bearing replacement; $5,000-7,500 for used engine swap