Daihatsu Copen: common faults & what to check

Which Daihatsu Copen are you looking at?

2 generation variants documented. Pick the shape you recognise: the faults, the servicing and the timeline below all narrow to it. Free, no account needed.

Petrol

2 variants documented

2002–2012L880K2002–2012L880K0.66 turbo petrol (kei)PetrolDocumented issues4 knownSee faults & what to checkPhoto: Rutger van der Maar via Wikimedia Commons, CC BY 2.0.

2014–nowLA400K2014–nowLA400K0.66 turbo petrol (kei)PetrolDocumented issues2 knownSee faults & what to checkPhoto: Tokumeigakarinoaoshima via Wikimedia Commons, CC0.

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Start your free check on this Daihatsu Copen

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

The checks worth doing on a Daihatsu Copen before you hand over any money. Every documented fault is listed below, each with its own page.

• Costly issue

  Probe the A-pillars, sills, subframe and roof drainage channels for rust and check for blocked drains and damp carpets.

  See why

  A-pillar and sill rust on Japanese imports

  Copen imports from Japan can develop rust in the A-pillars, sills, front subframe and around the folding-roof drainage areas, worsened by blocked drains trapping water. Convertible structure makes this structurally important for WoF. NZ coastal use accelerates the problem.

  What you would notice

  • Bubbling paint on A-pillars and sills
  • Rust around roof drain areas
  • Corrosion on subframe
  • Damp carpets from blocked drains

  Typically $500–$3,000 to put right.

• Costly issue

  Cycle the roof fully open and closed several times on level ground with the handbrake on, watching for hesitation, stalling or excessive noise.

  See why

  Powered Active Top retractable hardtop fails to cycle (motor/hydraulic wear, water ingress)

  The LA400K keeps a powered two-piece aluminium retractable hardtop that a hydraulic pump and linkage set folds into the boot in about 20 seconds at the press of a switch between the seats. As these cars age past their first decade the pump weakens and the roof cycles slowly or stalls part-way, and the boot area where the roof motors and rams live is prone to water ingress that corrodes connectors and microswitches. Owner communities consistently report roof-not-opening faults, blinking warning indicators and interlock issues (for example a poor handbrake or boot-latch switch contact halting the sequence). A stuck roof is the single biggest ownership variable on any Copen, and JDM parts scarcity in NZ pushes replacement pump/actuator costs up.

  What you would notice

  • Roof stalls or stops part-way through the open/close cycle
  • Roof will not start moving when the switch is pressed
  • Warning light or roof indicator flashing / error state
  • Slow or laboured roof operation, unusual motor whine
  • Standing water or damp carpet in the boot / roof storage well

  Typically $350–$2,600 to put right.

• Costly issue

  Check for blue smoke and turbo whine on a drive, inspect intercooler piping for oil, and confirm oil level and service history.

  See why

  JB-DET turbo wear and oil-starvation risk

  The L880K Copen's JB-DET 0.66 turbo four is sensitive to oil quality and level, and worn turbo bearings cause whistling, blue smoke and boost loss, especially on hot-shutdown cars. The tiny kei turbo spins very fast and coke-ups the oil feed if neglected. LA400K KF turbo cars are less affected but still oil-sensitive.

  What you would notice

  • Turbo whistle or whine
  • Blue smoke on start-up or overrun
  • Boost loss
  • Oil in intercooler piping

  Typically $700–$2,200 to put right.

• Costly issue

  Cycle the folding hardtop fully open and closed several times, listening for the pump and checking it latches and seals properly.

  See why

  L880K retractable hardtop hydraulic failure

  The first-generation L880K Copen's electro-hydraulic folding hardtop can fail through hydraulic pump leaks, tired seals, worn microswitches and sagging over time, leaving the roof stuck part-open. Water can then enter the cabin. Repairs are fiddly and parts are increasingly scarce.

  What you would notice

  • Roof stops mid-cycle
  • Hydraulic pump noise or leaks
  • Roof will not latch or seal
  • Water ingress when parked

  Typically $400–$2,000 to put right.

• Costly issue

  Check oil level and colour, look for blue smoke, and ask about oil top-up frequency given the small sump capacity.

  See why

  Oil consumption on high-km kei engines

  Both the JB-DET and later KF turbo engines can develop oil consumption at high mileage through valve-stem seals and rings, and the small sump means levels drop quickly, risking turbo damage if unchecked. Frequent short trips accelerate wear. Regular checks are vital on these low-capacity engines.

  What you would notice

  • Oil level dropping quickly
  • Blue smoke on start or overrun
  • Low oil warning
  • Fouled plugs

  Typically $400–$1,800 to put right.

Daihatsu Copen service schedule

What falls due, and at what distance, for each generation of the Daihatsu Copen. These are the model’s intervals — the car’s own service book is the only thing that can tell you what has actually been done to it.

What these repairs cost on other cars

Some of the Daihatsu Copen’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

• Turbo Repair and Replacement Cost

Other Daihatsu models