Kia Carens RP

Evolved common-rail diesel with slightly more displacement for better pull and smoother running than its smaller predecessor. On short trips the DPF can clog, since regeneration needs uninterrupted driving — plan occasional longer runs. The EGR valve and intake tract coke up over time, while injectors and glow plugs are typical wear points. When buying, watch for a rising oil level from fuel dilution and for soot traces. With clean servicing it is long-lived and torquey.

• !! EGR valve seized by soot deposits from 90,000 km

  The electronically controlled EGR valve of the D4FD becomes packed with soot deposits and sticks. Cleaning the valve and intake tract is routinely due at around 80,000–100,000 km.

  Symptoms: Judder at low load, engine warning light EGR fault, poor performance in the lower rev range
  150–600 $
  Ad EGR valve D4FD 1.7 CRDiintake manifold D4FD Sportage
• !! Injectors and sealing washer wear from 120,000 km

  Bosch direct injectors of the D4FD can be damaged by poor fuel quality. Copper sealing washers must be renewed every 100,000–150,000 km, otherwise combustion gases escape into the cylinder head.

  Symptoms: Hard starting, uneven running, increased fuel consumption, smoke on start-up
  200–800 $
  Ad fuel injectors D4FD 1.7 CRDi Kia SportageUnterlegscheiben fuel injector D4FD
• !! DPF blockage from approx. 150,000 km from 150,000 km

  From around 150,000 km the D4FD's DPF becomes problematic: blockage causes regeneration failures and oil dilution in the crankcase from fuel injected during forced regeneration.

  Symptoms: DPF warning light, engine power reduction, increased fuel consumption, oil level rises (diesel mixes into oil)
  700–2,500 $
  Ad DPF D4FD 1.7 CRDi Sportage Optimaparticulate filter 1.7 CRDi Kia

+ 4 more engine weaknesses + vehicle weaknesses

Direct-injection four-cylinder with good power output and willing revving. Because of the GDI design it tends to build intake-valve deposits from around 80,000 to 120,000 km — periodic walnut-blasting or additive cleaning keeps throttle response crisp. Chain-driven, but neglected oil can stretch the chain; a rattle on cold start is the warning sign. Keep an eye on oil consumption and use only approved oil. Overall robust, provided servicing and oil quality are right.

• !! High-pressure fuel pump failed from 100,000 km

  The high-pressure fuel pump (HPFP) can wear or fail prematurely. If fuel pressure drops, starting behaviour deteriorates severely; on total failure no start is possible.

  Symptoms: Long cranking, engine barely starts, engine stalls at low rpm, fault code P0087 (fuel pressure too low)
  400–900 $
  Ad high-pressure fuel pump G4FDhigh-pressure fuel pump 1.6 GDi35320-2B100
• !! High oil consumption from piston rings from 90,000 km

  Worn or brittle oil control rings cause high oil consumption, sometimes over 1 litre per 1,500 km. In the US a recall and class settlement with KSDS software addressed this.

  Symptoms: Rapidly dropping oil level, blue smoke, oil smell, cold-start knocking, flickering oil pressure light.
  1,500–4,000 $
  Ad piston rings G4FDpiston 23410-2B700engine rebuild Hyundai 1.6 GDi
• !! Timing chain stretch from 120,000 km

  The timing chain can stretch from medium mileage onward; in rare cases it jumps and valves meet pistons. Replacement is often needed between 100,000 and 150,000 km.

  Symptoms: Rattle on cold start, check engine light, rough running, engine damage in extreme cases.
  600–1,500 $
  Ad timing chain kit 24321-2B000timing chain 243502B600 G4FDchain tensioner Hyundai 1.6 GDi

+ 3 more engine weaknesses + vehicle weaknesses