2021 MITSUBISHI MIRAGE G4

Typical onset: 60,000-90,000 mi

Symptoms: Transmission overheating warning light, Metallic smell or burnt transmission fluid odor, Harsh engagement or slipping between Drive and Reverse, Loss of Drive completely after sitting in traffic

Fix: Replace transmission oil cooler and flush CVT fluid; usually 3-4 hours labor. Cooler itself is cheap ($150-250 OEM) but transmission damage from overheating can require full CVT replacement if caught late.

Estimated cost: $500-800 if caught early, $3,500-5,000 for CVT replacement if overheated

Typical onset: 50,000-80,000 mi

Symptoms: Clunking noise when shifting from Park to Drive or Reverse, Excessive vibration at idle, especially with AC on, Visible engine/trans movement when revving in Park, Harsh engagement feel

Fix: Replace transmission mount; design uses soft rubber that deteriorates quickly. 1.5-2 hours labor, straightforward bolt-on job.

Estimated cost: $250-400

Typical onset: 80,000-120,000 mi

Symptoms: Knocking or ticking noise from bottom end, especially cold start, Low oil pressure warning at idle when hot, Metal shavings in oil filter during routine changes, Sudden catastrophic failure with connecting rod through block

Fix: Root cause appears to be inadequate oiling system for a high-revving 3-cylinder under load, exacerbated by extended oil change intervals or low-quality oil. Repair requires short block replacement or full engine rebuild with new bearings, pistons, and rings. 12-16 hours labor for short block swap.

Estimated cost: $3,500-6,000 for short block, $2,500-4,000 for in-frame rebuild if caught before rod bearing spins

Typical onset: 70,000-110,000 mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible external leaks, Overheating in stop-and-go traffic, Bubbling or pressurization in coolant reservoir, Oil cap shows milky residue

Fix: Aluminum head expands more than block studs can accommodate when overheated. Requires head removal, resurfacing, new gasket, and timing chain work. 8-10 hours labor. Often triggered by failed thermostat or cooling system neglect.

Estimated cost: $1,800-2,800

Symptoms: Hard starting after sitting overnight, Loss of power on highway acceleration, Sputtering or stumbling under load, Check engine light with lean fuel trim codes

Fix: The in-tank fuel pump/filter assembly is sensitive to ethanol-phase separation and contamination. Requires dropping fuel tank and replacing pump module. 2-3 hours labor. More common in areas with older fuel infrastructure.

Estimated cost: $400-700

Typical onset: 40,000-80,000 mi

Symptoms: No-start condition with cranking but no fire, Stalling at idle or deceleration without warning, Check engine light with P0335 code (crank sensor circuit), Intermittent issue that may self-resolve temporarily

Fix: Sensor located low on block near starter, prone to heat soak and vibration damage on this 3-cylinder. 1-1.5 hours labor, but diagnosis can be tricky if intermittent. Replace don't clean.

Estimated cost: $200-350