The 2009 Daihatsu Copen is a JDM kei-car roadster with a 0.66L turbocharged three-cylinder engine. It's quirky and fun, but age and the stressed nature of the small turbo motor mean you'll see head gasket failures, lifter noise, and transmission cooling issues on higher-mileage examples.
Head Gasket Failure
Common · high severityTypical onset: 80,000-120,000 mi
Symptoms: white smoke from exhaust, coolant consumption without visible leaks, milky oil on dipstick, overheating under load
Fix: Full head gasket job requires head removal, resurfacing, new gasket set, timing belt replacement while you're in there, and coolant flush. Expect 12-16 hours labor on this compact engine bay. Many shops will suggest doing both head and block surfaces to ensure flatness.
Estimated cost: $2,200-3,800
Hydraulic Lifter Noise and Wear
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: ticking or tapping noise from valve cover, especially cold start, noise that may quiet after warmup but returns, rough idle
Fix: JB-DET uses hydraulic lifters that wear from oil starvation or poor maintenance. Replacing all lifters requires cam removal and careful timing alignment. Budget 8-10 hours labor. If only one or two are bad, some techs do single replacements but full set is recommended to avoid comebacks.
Estimated cost: $1,400-2,400
Transmission Oil Cooler Leaks
Occasional · medium severityTypical onset: 90,000-130,000 mi
Symptoms: ATF puddles under front of car, transmission overheating in traffic or spirited driving, burnt ATF smell, slipping or delayed shifts
Fix: The small external ATF cooler and lines corrode or crack, especially in rust-belt cars. Replacement involves dropping undertray, replacing cooler and lines, flushing system, refilling with fresh ATF. 3-4 hours labor. Often discovered during fluid changes when tech sees brown, burnt fluid.
Estimated cost: $600-1,100
Harmonic Balancer Deterioration
Occasional · high severityTypical onset: 100,000-140,000 mi
Symptoms: visible wobble or separation of outer ring from hub, serpentine belt shredding or walking off pulleys, vibration at idle that worsens with RPM, squealing from front of engine
Fix: Rubber isolator in the harmonic balancer degrades over time and heat cycles. If it separates, it can destroy the crank seal, alternator, and accessory belt. Replacement requires removing accessory belts, possibly radiator fan, and using a puller/installer tool. 2-3 hours labor. Inspect annually on high-mileage examples.
Estimated cost: $450-750
Turbo Wastegate Sticking and Overboost
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: surging or jerky power delivery, check engine light with overboost code, loss of power or excessive boost spikes, wastegate rattle on deceleration
Fix: Carbon buildup and corrosion cause the wastegate actuator to stick, leading to uncontrolled boost. Cleaning and freeing the wastegate can be done in 2-3 hours if caught early; turbo replacement is 6-8 hours and requires exhaust manifold removal. Regular Italian tuneups and quality oil help prevent this.
Estimated cost: $300-900 for cleaning; $1,800-2,800 for turbo replacement
Transmission Mount Collapse
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: clunking when shifting from park to drive or reverse, excessive engine movement when blipping throttle, vibration through shifter and floor
Fix: Rubber mounts fatigue quickly on this lightweight platform, especially if driven hard. Front and rear mounts should be inspected together. Replacement is straightforward, 1.5-2 hours per mount with proper support. OEM replacements last longer than cheap aftermarket.
Estimated cost: $250-500
Buy one if you're handy and budget $2,000-3,000 for deferred head and lifter work—it's a charming roadster, but the JB-DET engine is fragile when neglected.
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.