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1.4 and 1.6 16v vs 1.2 Dualjet and 1.2 VVT: which engine is more reliable?

According to our risk index, the 1.2 Dualjet and 1.2 VVT carries less risk than the 1.4 and 1.6 16v: 23/100 (low risk) versus 45/100 (moderate risk). The 1.4 and 1.6 16v has 1 documented serious fault, the main one being «Timing belt breakage or premature failure»; the 1.2 Dualjet and 1.2 VVT has no documented serious faults.

Risk index

1.4 and 1.6 16v

45

Moderate risk · 1 serious fault

Risk index

1.2 Dualjet and 1.2 VVT

23

Low risk · 0 serious faults

Lower risk

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

19 sourcesHow we work

Is the 1.4 and 1.6 16v reliable?

The K4J (1.4) and K4M (1.6), both naturally aspirated 16-valve units, are simple and generally reliable petrol engines: no source consulted documents oil consumption or faults that destroy the block. Their most-cited weak point is the ignition coils, followed by the crankshaft sensor and, on versions with a variable valve timing unit, its pulley; a neglected belt can cause serious damage, as one case in the Renault Laguna II documents.[1][2][3][4]

See the 6 of the 1.4 and 1.6 16v faults

Is the 1.2 Dualjet and 1.2 VVT reliable?

The Suzuki 1.2 VVT and 1.2 Dualjet (K12B/K12C/K12M) is a naturally aspirated petrol engine with a timing chain and indirect injection, fitted since 2008 to the Splash, Swift, Ignis and Baleno, with an SHVS mild-hybrid variant since 2016. It is reliable: there is no serious documented fault with the engine block itself; the main points are a clutch that wears out sooner than expected on some cars and two SHVS recalls that have already been resolved.[5][6][7][8][9]

See the 5 of the 1.2 Dualjet and 1.2 VVT faults

Side-by-side comparison

Comparison of 1.4 and 1.6 16v and 1.2 Dualjet and 1.2 VVT
1.4 and 1.6 16v1.2 Dualjet and 1.2 VVT
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingTiming belt (dry)Chain
Power75–135 hp82–92 hp
Productionsince 1998[10][11][12]since 2008[5][6]
Reliability
Risk index (what is it?)45Moderate risk23Low risk
Documented faults65
Of high or critical severity10
Worst severityHigh severityMedium severity
Main faults
  1. Medium severity: Ignition coil failure
  2. High severity: Timing belt breakage or premature failure
  3. Medium severity: Crankshaft position sensor failure
  1. Medium severity: Clutch: premature wear and clutch cable anchor failure
  2. Medium severity: SHVS mild-hybrid system: recalls for the starter generator belt and software
  3. Medium severity: Water pump pulley fixing (2013-2014): recall
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versions
  • 1.6 16V 105-110 hp Dacia, without variable valve timing unit (K4M, 2004-2020)[4][13]
  • 1.2 VVT 86-92 hp (K12B, one injector per cylinder, 2008-2013)[8]
  • 1.2 Dualjet non-hybrid 89-91 hp (K12B/K12C, dual injector, 2013-2020)[9][14][15]
  • 1.2 Dualjet SHVS mild hybrid 82-90 hp (K12C/K12D, since 2016)[9]
With cautionVersions to be cautious about
  • 1.4 16V 75-100 hp (K4J, 1999-2012)[16][17]
  • 1.6 16V 110-135 hp with variable valve timing unit (K4M, 1998-2020)[3][18][19]
None
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

1.4 and 1.6 16v

See the 13 models with the 1.4 and 1.6 16v

1.2 Dualjet and 1.2 VVT

See the 7 models with the 1.2 Dualjet and 1.2 VVT

Other comparisons

With the 1.4 and 1.6 16v

With the 1.2 Dualjet and 1.2 VVT

Compare other engines

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Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Fiabilité et pannes de la Renault Mégane 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  2. Fiabilité et pannes du Renault Scénic 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  3. Fiabilité et pannes de la Renault Laguna 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  4. Fiabilité et pannes du Dacia Duster 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  5. Suzuki motor KWikipedia · Other source · consulted 27 September 2026 · in Spanish
  6. Suzuki K engineWikipedia · Other source · consulted 27 September 2026
  7. Suzuki Swift (NZ) – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
  8. Suzuki Splash (2008–2014) – Bekannte Probleme & KrankheitenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
  9. Suzuki Ignis (MF, ab 2016) – Bekannte Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
  10. Renault K-Type engineWikipedia (inglés) · Other source · consulted 27 September 2026
  11. Moteur K RenaultWikipedia (francés) · Other source · consulted 27 September 2026 · in French
  12. Anexo:Motores de RenaultWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
  13. Fiabilité et pannes du Dacia Logan 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  14. Suzuki Ignis : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
  15. Suzuki Swift 2 : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
  16. Fiabilité et pannes de la Renault Clio 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  17. Fiabilité et pannes de la Renault Clio 3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  18. Fiabilité et pannes de la Renault Mégane 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  19. Fiabilité et pannes du Renault Scénic 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French