The 2025 eK X is too new for extensive field data, but its BR06 turbo three-cylinder shares DNA with prior-generation kei cars that showed CVT cooler failures, timing-chain stretch, and lifter noise under sustained high-load operation—issues amplified by Japan's kei-class tax rules encouraging owners to flog small-displacement turbos.
CVT Transmission Oil Cooler Failure
Occasional · high severityTypical onset: 50,000-80,000 mi
Symptoms: Transmission overheating warnings on dash, Burnt CVT fluid smell, Harsh shifting or slipping under load, Pink fluid residue under vehicle from cooler leak
Fix: Replace transmission oil cooler and flush entire CVT system; 3.5-4.5 labor hours including fluid refill and road test. Cooler itself is ~$350-500 parts, plus 6-7 quarts of Mitsubishi CVT fluid at $18-25/qt.
Estimated cost: $800-1,200
Timing Chain Stretch and Tensioner Wear
Occasional · high severityTypical onset: 70,000-110,000 mi
Symptoms: Cold-start rattle lasting 3-5 seconds, Check engine light with cam/crank correlation codes (P0016, P0017), Rough idle and hesitation on acceleration, Metallic rattling from front of engine under load
Fix: Timing chain kit replacement including guides, tensioner, and both cam gears; 8-10 hours labor due to tight engine bay and front-cover removal. Should replace front crank seal and water pump while in there.
Estimated cost: $1,800-2,800
Hydraulic Lifter Collapse / Tappet Noise
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Persistent ticking/tapping from valve cover at idle, Noise increases with engine temperature, Loss of power on hard acceleration, Noise may quiet down after oil change, then return within 2,000 mi
Fix: Replace all hydraulic lifters, often requires cylinder head removal for proper cleaning and inspection; 6-8 hours labor. Set of 6 lifters runs $180-300, head gasket kit another $120-180. Use only OEM Mitsubishi lifters—aftermarket consistently fails early.
Estimated cost: $1,400-2,200
Transmission Mount Deterioration
Common · low severityTypical onset: 40,000-70,000 mi
Symptoms: Clunking when shifting from Park to Drive/Reverse, Excessive engine movement visible when revving in Park, Vibration through cabin at idle, especially with A/C on, Transmission feels like it's 'settling' after throttle lift
Fix: Replace passenger-side transmission mount (most common failure point); 1.5-2 hours labor. Mount costs $80-140. Small engine bay makes access tight—often need to support engine from above.
Estimated cost: $250-400
Harmonic Balancer Rubber Separation
Rare · high severityTypical onset: 80,000-120,000 mi
Symptoms: Severe vibration at specific RPM ranges (usually 2,000-2,500 RPM), Squealing from serpentine belt area, Visible wobble of crankshaft pulley when idling, Check engine light with misfire codes on all cylinders
Fix: Replace harmonic balancer/crankshaft pulley; 2.5-3 hours labor as requires careful extraction without damaging crank snout. New balancer $180-280. If rubber fully separates, can grenade timing cover—immediate tow required.
Estimated cost: $450-700
Fuel Filter Clogging (Turbo Models)
Occasional · medium severitySymptoms: Hesitation or stumble under boost, Loss of power above 4,000 RPM, Hard starting when hot, Fuel pump whine audible in cabin
Fix: Replace in-tank fuel filter; 2-2.5 hours labor including tank drop or pump access panel removal (varies by build date). Filter ~$60-90. Mitsubishi official interval is 60k mi, but turbo cars on US pump gas often need it at 40k.
Estimated cost: $280-450
Decent city kei car if you can get one cheap and commit to religious CVT fluid changes, but the turbo three-cylinder's long-term durability in North America remains unproven—I'd want a powertrain warranty or buy it as a disposable commuter under $8k.
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.