Honda CR-Z ZF1

1.5L i-VTEC naturally aspirated with integrated IMA electric motor (Integrated Motor Assist) in the CR-Z: the combustion engine produces 83 kW, the electric motor adds up to 10 kW of assist, giving 89 kW combined system output. Three drive modes (ECON/Normal/Sport) noticeably alter throttle response and IMA readiness. The main weak point is the ageing NiMH high-voltage battery, which degrades significantly after 10–15 years.

• !! IMA high-voltage battery ageing — hybrid power fades from 150,000 km

  The NiMH IMA high-voltage battery degrades noticeably after 10–15 years or 150,000 km. A new OEM module costs up to €3,000; reconditioned units start at around €700.

  Symptoms: IMA warning light active, noticeably reduced hybrid assist, engine starts alone more frequently
  700–3,000 $
  Ad IMA battery Honda CR-Z ZF1
• !! DC/DC converter failure — IMA system shut down from 120,000 km

  A faulty DC/DC converter in the IMA system disables the hybrid function entirely. Diagnosis and replacement require a high-voltage specialist.

  Symptoms: IMA system completely shut down, hybrid function unavailable, IMA warning light permanently active
  400–1,200 $
  Ad DC DC Konverter Honda IMA
• !! Ignition coil failure and misfires from 80,000 km

  Ignition coils on the LEA engine can fail prematurely due to ageing or worn spark plugs. Common on vehicles without regular spark plug maintenance (interval: 30,000 km).

  Symptoms: Engine hesitation and misfires, engine warning light, rough idle. Fault is more pronounced in damp conditions and heat.
  100–400 $
  Ad ignition coil Honda CR-Z LEAspark plugs Honda CR-Z 1.5 i-VTECignition coil set LEA engine

+ 1 more engine weaknesses + vehicle weaknesses