The 2012 Daihatsu Mira with its 0.66L KF engine is a compact kei car that's generally reliable for urban use, but shows predictable wear patterns in the valvetrain and CVT cooling system as mileage accumulates. Engine longevity depends heavily on maintaining proper oil change intervals and addressing CVT heat issues early.
CVT Transmission Oil Cooler Failure
Common · high severityTypical onset: 70,000-110,000 mi
Symptoms: Transmission overheating warning light, Delayed engagement or slipping during acceleration, Burnt transmission fluid smell, Reduced fuel economy and sluggish performance
Fix: Replace transmission oil cooler and flush/refill CVT fluid. Cooler lines often corrode internally causing blockage. 3-4 hours labor including fluid flush and system purge.
Estimated cost: $600-1,200
Hydraulic Lifter Noise and Failure
Common · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Ticking or tapping noise from engine on cold start that may persist, Rough idle quality, Reduced power and fuel economy, Check engine light with misfire codes
Fix: Replace all hydraulic lifters/tappets with camshaft inspection. The KF engine is sensitive to oil quality and extended drain intervals cause lifter collapse. Requires valve cover removal and careful reassembly. 5-6 hours labor.
Estimated cost: $800-1,400
Timing Chain Stretch and Tensioner Wear
Occasional · high severityTypical onset: 100,000-150,000 mi
Symptoms: Rattling noise from front of engine on startup, Rough running or hesitation, Check engine light with timing-related codes, Poor fuel economy
Fix: Replace timing chain, tensioner, guides, and verify cam timing. Small-displacement engines run chains hard. Requires front cover removal. 6-8 hours labor due to tight engine bay access.
Estimated cost: $1,200-2,000
Head Gasket Failure
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Overheating or erratic temperature gauge readings, Milky oil on dipstick or oil cap, Rough idle and loss of power
Fix: Replace head gasket with cylinder head resurfacing. Often related to overheating from CVT cooler failures or coolant neglect. Requires head removal and inspection for warpage. 8-10 hours labor including machining.
Estimated cost: $1,500-2,500
Harmonic Balancer Deterioration
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Vibration at idle worsening with RPM, Squealing noise from accessory belt area, Visible separation of rubber layer from pulley, Accessory belt tracking issues
Fix: Replace harmonic balancer/crankshaft pulley. Rubber deteriorates causing imbalance and potential accessory drive problems. 2-3 hours labor including belt replacement.
Estimated cost: $400-700
Transmission Mount Collapse
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from Park to Drive, Excessive engine movement visible under acceleration, Vibration transmitted into cabin at idle, Difficulty engaging gears smoothly
Fix: Replace transmission mount(s). Rubber mounts deteriorate from heat and vibration typical of small engines working hard. 1.5-2 hours labor.
Estimated cost: $250-450
Buy one if you need affordable urban transportation and can commit to frequent oil changes and CVT maintenance, but avoid high-mileage examples over 100k without documented engine and transmission service history.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.