Skip to content
MotorFiable
en

1.0 T3 and 1.3 T4 FireFly Turbo 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 1.0 T3 and 1.3 T4 FireFly Turbo: 6/100 versus 18/100 (both low risk). The 1.0 T3 and 1.3 T4 FireFly Turbo has no documented serious faults; the 1.0 and 1.4 Boosterjet has no documented serious faults.

Risk index

1.0 T3 and 1.3 T4 FireFly Turbo

18

Low risk · 0 serious faults

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

18 sourcesHow we work

Is the 1.0 T3 and 1.3 T4 FireFly Turbo reliable?

The FireFly turbo 1.0 T3 and 1.3 T4 show no systemic fault in open sources; there are only isolated cases of jerking with replacement of the MultiAir block on the 1.0 and one engine failure on a 1.3. The evidence is thin and is not a guarantee of reliability.[1][2][3]

See the 2 of the 1.0 T3 and 1.3 T4 FireFly Turbo 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.[4][5][6][7][8]

See the 4 of the 1.0 and 1.4 Boosterjet faults

Side-by-side comparison

Comparison of 1.0 T3 and 1.3 T4 FireFly Turbo and 1.0 and 1.4 Boosterjet
1.0 T3 and 1.3 T4 FireFly Turbo1.0 and 1.4 Boosterjet
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,332 cm³—
TimingChainChain
Power100–180 hp110–140 hp
Productionsince 2018[9]since 2015[4][10][11][12]
Reliability
Risk index (what is it?)18Low risk6Low risk
Documented faults24
Of high or critical severity00
Worst severityMedium severityLow severity
Main faults
  1. Medium severity: Oil consumption and premature turbo wear on the 1.0 T3 and 1.3 T4
  2. Medium severity: Jerking and MultiAir block failures on the 1.0 T3
  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
  • 1.3 GSE T4 Turbo 150-180 hp (FireFly, since 2018)[1][13]
  • 1.3 GSE T4 Turbo plug-in hybrid 4xe (130-180 hp from the petrol engine, since 2021)[14][15]
  • 1.0 Boosterjet 110-112 hp (K10C, three-cylinder, 2015-present)[5][6][16][17]
  • 1.4 Boosterjet 140 hp (K14C, non-hybrid, 2015-2020 in Europe)[5][6][18]
  • 1.4 Boosterjet Mild Hybrid 129 hp (K14D, 48V SHVS, since 2020)[11][12]
With cautionVersions to be cautious about
  • 1.0 GSE T3 Turbo 100-120 hp (FireFly, since 2018)[1][2]
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

1.0 T3 and 1.3 T4 FireFly Turbo

1.0 and 1.4 Boosterjet

See the 12 models with the 1.0 and 1.4 Boosterjet

Other comparisons

With the 1.0 T3 and 1.3 T4 FireFly Turbo

With the 1.0 and 1.4 Boosterjet

Compare other engines

That is the comparison you are viewing: change one of the two engines.

Sources

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

  1. Fiabilité Jeep: témoignages de propriétairesfiches-auto.fr · Other source · consulted 29 October 2026 · in French
  2. Fiabilité Fiat: témoignages de propriétairesfiches-auto.fr · Other source · consulted 29 October 2026 · in French
  3. Broken chain in Firefly 1.0 engineFiat Forum · Owners' forum · consulted 30 October 2026
  4. Suzuki K engineWikipedia · Other source · consulted 27 September 2026
  5. Gebrauchtwagen-Check: Grundsätzlich gut: Der Suzuki Vitara beim TÜVVolksstimme (dpa) · General press · published January 2026 · consulted 27 September 2026 · in German
  6. Suzuki Swift als Gebrauchtwagen: Diese Punkte beanstandet der TÜV häufigT-Online · General press · published October 2025 · consulted 27 September 2026 · in German
  7. 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
  8. Test complet Suzuki VitaraFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  9. Fiat Global Small EngineWikipedia (inglés) · Other source · consulted 29 October 2026
  10. Suzuki motor KWikipedia · Other source · consulted 27 September 2026 · in Spanish
  11. 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
  12. 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
  13. Problemas Jeep CompassTotal Renting · Other source · consulted 29 October 2026 · in Spanish
  14. Jeep Renegade Problemecarwiki.de · Other source · consulted 29 October 2026 · in German
  15. Jeep Renegade 4xe plug-in hybrid reliability and safetyDriving Electric · Motoring press · consulted 29 October 2026
  16. Suzuki Vitara : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
  17. Suzuki Swift 3 : avis, qualités et défauts des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
  18. Prueba Suzuki Swift Sport 1.4 Boosterjet 140 CVActualidad Motor · Motoring press · published 16 May 2018 · consulted 27 September 2026 · in Spanish