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0.9 TwinAir and 1.0/1.3 FireFly vs Honda e:HEV / i-MMD: which engine is more reliable?

According to our risk index, the 0.9 TwinAir and 1.0/1.3 FireFly carries less risk than the Honda e:HEV / i-MMD: 32/100 versus 34/100 (both moderate risk). The 0.9 TwinAir and 1.0/1.3 FireFly has 1 documented serious fault, the main one being «Early turbocharger failure (0.9 TwinAir)»; the Honda e:HEV / i-MMD has 2 documented serious faults, the main one being «Cracked high-pressure fuel pump (Honda campaign 6YP)».

Risk index

0.9 TwinAir and 1.0/1.3 FireFly

32

Moderate risk · 1 serious fault

Lower risk

Risk index

Honda e:HEV / i-MMD

34

Moderate risk · 2 serious faults

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

13 sourcesHow we work

Is the 0.9 TwinAir and 1.0/1.3 FireFly reliable?

The 0.9 TwinAir (2010-2020) and the 1.0/1.3 FireFly (from 2018, with a mild-hybrid version from 2020) are the small petrol engines of Fiat, Jeep and Lancia. The TwinAir has no systemic faults, but it does have repeated, minority cases of turbo, MultiAir unit, oil consumption and clutch or flywheel wear, consistent with its uneven two-cylinder running. The newer FireFly has so far recorded little more than isolated Start&Stop faults.[1][2][3][4][5]

See the 5 of the 0.9 TwinAir and 1.0/1.3 FireFly faults

Is the Honda e:HEV / i-MMD reliable?

The Honda e:HEV hybrid system (formerly i-MMD) has no serious, widespread faults documented in the sources consulted. The most cited issue is the 12 V battery going flat when the car stands unused and, on the 2.0, a recall for the high-pressure fuel pump.[6][7][8]

See the 3 of the Honda e:HEV / i-MMD faults

Side-by-side comparison

Comparison of 0.9 TwinAir and 1.0/1.3 FireFly and Honda e:HEV / i-MMD
0.9 TwinAir and 1.0/1.3 FireFlyHonda e:HEV / i-MMD
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power70–180 hp109–184 hp
Productionsince 2010[9][10]since 2018[6][11]
Reliability
Risk index (what is it?)32Moderate risk34Moderate risk
Documented faults53
Of high or critical severity12
Worst severityHigh severityHigh severity
Main faults
  1. High severity: Early turbocharger failure (0.9 TwinAir)
  2. Medium severity: MultiAir/UniAir hydraulic unit failure (0.9 TwinAir)
  3. Medium severity: Clutch and flywheel wear (0.9 TwinAir)
  1. High severity: Cracked high-pressure fuel pump (Honda campaign 6YP)
  2. High severity: Faulty fuel pump impeller on the 2019-2020 CR-V hybrid (Honda 6FE campaign)
  3. Low severity: 12 V battery going flat and hybrid system failing to start
Most expensive documented repairNo reliable dataup to €25012 V battery going flat and hybrid system failing to startPublished figure[6]
Which versions to buy
BuyRecommended versions
  • 1.0 FireFly Hybrid 70 hp (GSE, from 2020)[1][2]
  • 1.0 GSE T3 Turbo 100-120 hp (FireFly, from 2018)[3][12]
  • e:HEV 1.5 (LEB-H5) 109-131 hp system output (Jazz IV, HR-V III)[6][11]
With cautionVersions to be cautious about
  • 0.9 TwinAir 78-105 hp (2010-2020)[1][2][4][5]
  • 1.3 GSE T4 Turbo 150-180 hp (FireFly, from 2018)[3]
  • i-MMD 2.0 184 hp system output (CR-V V hybrid)[6][7]
  • e:HEV 2.0 184 hp system output (Civic XI)[7][13]
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

0.9 TwinAir and 1.0/1.3 FireFly

See the 8 models with the 0.9 TwinAir and 1.0/1.3 FireFly

Honda e:HEV / i-MMD

Other comparisons

With the 0.9 TwinAir and 1.0/1.3 FireFly

With the Honda e:HEV / i-MMD

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 Fiat 500 (2007)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  2. Fiabilité et pannes de la Fiat Panda (depuis 2012)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  3. Fiabilité et pannes du Jeep RenegadeFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  4. Fiat 500 (ab 2007) – alle bekannten Probleme & KrankheitenGebrauchtwagenberater.de · Motoring press · published 24 November 2023 · consulted 27 September 2026 · in German
  5. Fiat Panda III (seit 2011) – Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 21 January 2023 · consulted 27 September 2026 · in German
  6. Sistema híbrido Honda e:HEV (i-MMD): problemas, fiabilidad y coches que lo llevanMotordex · Technical documentation · consulted 29 October 2026 · in Spanish
  7. Honda recalls 1.3 million cars: fuel pump fire risk (KBA 14559R)Car-Recalls.eu · Motoring press · published 17 March 2025 · consulted 29 October 2026
  8. Fiabilité Honda HR-V (2022): pannes et témoignagesFiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
  9. Fiat TwinAir engineWikipedia (inglés) · Other source · consulted 27 September 2026
  10. Fiat Global Small EngineWikipedia (inglés) · Other source · consulted 27 September 2026
  11. Honda LEB-H5 (1.5 i-MMD e:HEV): experiencias, problemas, consumo y consejos de compraAutohints · Technical documentation · consulted 29 October 2026 · in Spanish
  12. Fiabilité et pannes de la Fiat 500XFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  13. Guide d'achat Honda Civic (nueva campaña 6YP, 4.740 híbridos en Francia)L'argus · Motoring press · published 7 January 2025 · consulted 29 October 2026 · in French