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1.4 and 1.6 16v vs 1.0 and 1.4 Boosterjet: which engine is more reliable?

According to our risk index, the 1.0 and 1.4 Boosterjet carries less risk than the 1.4 and 1.6 16v: 6/100 (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 1.0 and 1.4 Boosterjet has no documented serious faults.

Risk index

1.4 and 1.6 16v

45

Moderate risk · 1 serious fault

Risk index

1.0 and 1.4 Boosterjet

6

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

23 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 5 of the 1.4 and 1.6 16v faults

Is the 1.0 and 1.4 Boosterjet reliable?

The Suzuki Boosterjet (1.0 K10C and 1.4 K14C/K14D) is a turbocharged direct-injection petrol engine with a timing chain, fitted since 2015 to the Vitara, S-Cross, Swift Sport and Baleno, with a 48 V mild-hybrid variant of the 1.4 since 2020. German TÜV inspection reports and the workshops we consulted rate its reliability as high: no widespread fault with the chain, oil, fuel pump or mild-hybrid system is documented.[5][6][7][8][9]

See the 4 of the 1.0 and 1.4 Boosterjet faults

Side-by-side comparison

Comparison of 1.4 and 1.6 16v and 1.0 and 1.4 Boosterjet
1.4 and 1.6 16v1.0 and 1.4 Boosterjet
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingTiming belt (dry)Chain
Power75–135 hp110–140 hp
Productionsince 1998[10][11][12]since 2015[5][13][14][15]
Reliability
Risk index (what is it?)45Moderate risk6Low risk
Documented faults54
Of high or critical severity10
Worst severityHigh severityLow 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. Low severity: Timing chain: no documented pattern of failures
  2. Low severity: Oil consumption: no documented pattern
  3. Low severity: Direct injection and fuel pump: no documented faults or recalls
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][16]
  • 1.0 Boosterjet 110-112 hp (K10C, three-cylinder, 2015-present)[6][7][17][18]
  • 1.4 Boosterjet 140 hp (K14C, non-hybrid, 2015-2020 in Europe)[6][7][19]
  • 1.4 Boosterjet Mild Hybrid 129 hp (K14D, 48V SHVS, since 2020)[14][15]
With cautionVersions to be cautious about
  • 1.4 16V 75-100 hp (K4J, 1999-2012)[20][21]
  • 1.6 16V 110-135 hp with variable valve timing unit (K4M, 1998-2020)[3][22][23]
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

1.0 and 1.4 Boosterjet

See the 12 models with the 1.0 and 1.4 Boosterjet

Other comparisons

With the 1.4 and 1.6 16v

With the 1.0 and 1.4 Boosterjet

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 K engineWikipedia · Other source · consulted 27 September 2026
  6. Gebrauchtwagen-Check: Grundsätzlich gut: Der Suzuki Vitara beim TÜVVolksstimme (dpa) · General press · published January 2026 · consulted 27 September 2026 · in German
  7. Suzuki Swift als Gebrauchtwagen: Diese Punkte beanstandet der TÜV häufigT-Online · General press · published October 2025 · consulted 27 September 2026 · in German
  8. Los mecánicos recomiendan el Suzuki Vitara porque no presume de moderno, sino de sencillo y baratoEl Nacional · General press · published September 2026 · consulted 27 September 2026 · in Spanish
  9. Test complet Suzuki VitaraFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  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. Suzuki motor KWikipedia · Other source · consulted 27 September 2026 · in Spanish
  14. Suzuki Swift Sport, Vitara y S-Cross: nuevas versiones micro-híbridas de 48VAutopista.es · Motoring press · published 16 December 2019 · consulted 27 September 2026 · in Spanish
  15. Suzuki S-Cross 1.4 Boosterjet Mild Hybrid 2020: precios y datos del nuevo SUVAutopista.es · Motoring press · published 12 March 2020 · consulted 27 September 2026 · in Spanish
  16. Fiabilité et pannes du Dacia Logan 1Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  17. Suzuki Vitara : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
  18. Suzuki Swift 3 : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
  19. Prueba Suzuki Swift Sport 1.4 Boosterjet 140 CVActualidad Motor · Motoring press · published 16 May 2018 · consulted 27 September 2026 · in Spanish
  20. Fiabilité et pannes de la Renault Clio 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  21. Fiabilité et pannes de la Renault Clio 3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  22. Fiabilité et pannes de la Renault Mégane 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  23. Fiabilité et pannes du Renault Scénic 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French