1.0 and 1.4 Boosterjet vs 1.2 Dualjet and 1.2 VVT: which engine is more reliable?

According to our risk index, the 1.0 and 1.4 Boosterjet carries less risk than the 1.2 Dualjet and 1.2 VVT: 6/100 versus 23/100 (both low risk). The 1.0 and 1.4 Boosterjet has no documented serious faults; the 1.2 Dualjet and 1.2 VVT has no documented serious faults.

Risk index

1.0 and 1.4 Boosterjet

Low risk · 0 serious faults

Lower risk

Risk index

1.2 Dualjet and 1.2 VVT

Low risk · 0 serious faults

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

Reviewed on 27 September 202616 sources How we work

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.^{[1][2][3][4][5]}

See the 4 of the 1.0 and 1.4 Boosterjet 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.^{[1][6][7][8][9]}

See the 5 of the 1.2 Dualjet and 1.2 VVT faults

Side-by-side comparison

Comparison of 1.0 and 1.4 Boosterjet and 1.2 Dualjet and 1.2 VVT
Item	1.0 and 1.4 Boosterjet	1.2 Dualjet and 1.2 VVT
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	—	—
Timing	Chain	Chain
Power	110–140 hp	82–92 hp
Production	since 2015^{[1][6][10][11]}	since 2008^[1][6]
Reliability
Risk index (what is it?)	6Low risk	23Low risk
Documented faults	4	5
Of high or critical severity	0	0
Worst severity	Low severity	Medium severity
Main faults	Low severity: Timing chain: no documented pattern of failures Low severity: Oil consumption: no documented pattern Low severity: Direct injection and fuel pump: no documented faults or recalls	Medium severity: Clutch: premature wear and clutch cable anchor failure Medium severity: SHVS mild-hybrid system: recalls for the starter generator belt and software Medium severity: Water pump pulley fixing (2013-2014): recall
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	1.0 Boosterjet 110-112 hp (K10C, three-cylinder, 2015-present)^{[2][3][12][13]} 1.4 Boosterjet 140 hp (K14C, non-hybrid, 2015-2020 in Europe)^[2][3][14] 1.4 Boosterjet Mild Hybrid 129 hp (K14D, 48V SHVS, since 2020)^[10][11]	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][15][16] 1.2 Dualjet SHVS mild hybrid 82-90 hp (K12C/K12D, since 2016)^[9]
With cautionVersions to be cautious about	None	None
AvoidVersions to avoid	None	None

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

Cars that each one is fitted to

1.0 and 1.4 Boosterjet

See the 12 models with the 1.0 and 1.4 Boosterjet

1.2 Dualjet and 1.2 VVT

See the 7 models with the 1.2 Dualjet and 1.2 VVT

Other comparisons

With the 1.0 and 1.4 Boosterjet

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.

Suzuki K engineWikipedia · Other source · consulted 27 September 2026
Gebrauchtwagen-Check: Grundsätzlich gut: Der Suzuki Vitara beim TÜVVolksstimme (dpa) · General press · published January 2026 · consulted 27 September 2026 · in German
Suzuki Swift als Gebrauchtwagen: Diese Punkte beanstandet der TÜV häufigT-Online · General press · published October 2025 · consulted 27 September 2026 · in German
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
Test complet Suzuki VitaraFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Suzuki motor KWikipedia · Other source · consulted 27 September 2026 · in Spanish
Suzuki Swift (NZ) – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Suzuki Splash (2008–2014) – Bekannte Probleme & KrankheitenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Suzuki Ignis (MF, ab 2016) – Bekannte Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
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
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
Suzuki Vitara : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Suzuki Swift 3 : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Prueba Suzuki Swift Sport 1.4 Boosterjet 140 CVActualidad Motor · Motoring press · published 16 May 2018 · consulted 27 September 2026 · in Spanish
Suzuki Ignis : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Suzuki Swift 2 : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French