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Mitsubishi PHEV 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 Mitsubishi PHEV: 6/100 versus 24/100 (both low risk). The Mitsubishi PHEV has 2 documented serious faults, the main one being «Corroded air flow sensor: the petrol engine does not start to charge the battery»; the 1.0 and 1.4 Boosterjet has no documented serious faults.

Risk index

Mitsubishi PHEV

24

Low risk · 2 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

20 sourcesHow we work

Is the Mitsubishi PHEV reliable?

Yes, with caveats: the OCU ranks the Outlander PHEV first for reliability among used plug-in hybrids. What is documented are isolated campaigns (spark plugs and software, air flow sensor, fuel hose) and a possible loss of battery capacity, cited by one source and one study without figures. The Eclipse Cross PHEV, which uses the same system, has no documented faults of its own.[1][2][3][4][5]

See the 5 of the Mitsubishi PHEV 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.[6][7][8][9][10]

See the 4 of the 1.0 and 1.4 Boosterjet faults

Side-by-side comparison

Comparison of Mitsubishi PHEV and 1.0 and 1.4 Boosterjet
Mitsubishi PHEV1.0 and 1.4 Boosterjet
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power163–224 hp110–140 hp
Productionsince 2013[11][12][13]since 2015[6][14][15][16]
Reliability
Risk index (what is it?)24Low risk6Low risk
Documented faults54
Of high or critical severity20
Worst severityHigh severityLow severity
Main faults
  1. Medium severity: Loss of traction battery (high-voltage) capacity
  2. Medium severity: Spark plugs and petrol engine software on the Outlander PHEV (campaign R3033111)
  3. High severity: Corroded air flow sensor: the petrol engine does not start to charge the battery
  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
  • 2.4 Eclipse Cross PHEV (4B12, 13.8 kWh battery, 2021-2024)[4][5]
  • 1.0 Boosterjet 110-112 hp (K10C, three-cylinder, 2015-present)[7][8][17][18]
  • 1.4 Boosterjet 140 hp (K14C, non-hybrid, 2015-2020 in Europe)[7][8][19]
  • 1.4 Boosterjet Mild Hybrid 129 hp (K14D, 48V SHVS, since 2020)[15][16]
With cautionVersions to be cautious about
  • 2.0 Outlander PHEV (4B11, 12 kWh battery, 2013-2018)[3][4][20]
  • 2.4 Outlander PHEV (4B12, 13.8 kWh battery, 2018-2021)[1][2][3]
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

Mitsubishi PHEV

1.0 and 1.4 Boosterjet

See the 12 models with the 1.0 and 1.4 Boosterjet

Other comparisons

With the Mitsubishi PHEV

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. Mitsubishi Outlander PHEV, el híbrido enchufable de segunda mano más fiable según la OCUHíbridos y Eléctricos · Motoring press · published 14 May 2024 · consulted 8 October 2026 · in Spanish
  2. Mitsubishi Outlander (II & III) – Bekannte Probleme und MängelGebrauchtwagenberater (Alemania) · Motoring press · published 2 March 2023 · consulted 8 October 2026 · in German
  3. Baterías de híbrido enchufable: cuándo habrá que sustituirlas (Outlander PHEV)Autofácil · Motoring press · published 7 May 2020 · consulted 8 October 2026 · in Spanish
  4. DVSA – base de llamadas a revisiónDVSA (Reino Unido) · Other source · consulted 8 October 2026
  5. El Mitsubishi Eclipse Cross PHEV sí llegará a Europa, incluida España, en 2021Híbridos y Eléctricos · Motoring press · published 18 October 2020 · consulted 8 October 2026 · in Spanish
  6. Suzuki K engineWikipedia · Other source · consulted 27 September 2026
  7. Gebrauchtwagen-Check: Grundsätzlich gut: Der Suzuki Vitara beim TÜVVolksstimme (dpa) · General press · published January 2026 · consulted 27 September 2026 · in German
  8. Suzuki Swift als Gebrauchtwagen: Diese Punkte beanstandet der TÜV häufigT-Online · General press · published October 2025 · consulted 27 September 2026 · in German
  9. 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
  10. Test complet Suzuki VitaraFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  11. Mitsubishi Outlander PHEVWikipedia (inglés) · Other source · consulted 8 October 2026
  12. Mitsubishi OutlanderWikipedia (alemán) · Other source · consulted 8 October 2026 · in German
  13. Mitsubishi 4B1 engineWikipedia (inglés) · Other source · consulted 8 October 2026
  14. Suzuki motor KWikipedia · Other source · consulted 27 September 2026 · in Spanish
  15. 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
  16. 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
  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. Mitsubishi Outlander PHEV (2013 – 2014): alerta A12/1947/19 (sensor de caudal de aire)car-recalls.eu (alertas Safety Gate / RAPEX) · Other source · published 13 December 2019 · consulted 8 October 2026