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1.0 T3 and 1.3 T4 FireFly Turbo vs Honda e:HEV / i-MMD: which engine is more reliable?

According to our risk index, the 1.0 T3 and 1.3 T4 FireFly Turbo carries less risk than the Honda e:HEV / i-MMD: 18/100 (low risk) versus 34/100 (moderate risk). The 1.0 T3 and 1.3 T4 FireFly Turbo has no documented serious faults; 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

1.0 T3 and 1.3 T4 FireFly Turbo

18

Low risk · 0 serious faults

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

12 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 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.[4][5][6]

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

Side-by-side comparison

Comparison of 1.0 T3 and 1.3 T4 FireFly Turbo and Honda e:HEV / i-MMD
1.0 T3 and 1.3 T4 FireFly TurboHonda e:HEV / i-MMD
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,332 cm³—
TimingChainChain
Power100–180 hp109–184 hp
Productionsince 2018[7]since 2018[4][8]
Reliability
Risk index (what is it?)18Low risk34Moderate risk
Documented faults23
Of high or critical severity02
Worst severityMedium severityHigh 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. 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[4]
Which versions to buy
BuyRecommended versions
  • 1.3 GSE T4 Turbo 150-180 hp (FireFly, since 2018)[1][9]
  • 1.3 GSE T4 Turbo plug-in hybrid 4xe (130-180 hp from the petrol engine, since 2021)[10][11]
  • e:HEV 1.5 (LEB-H5) 109-131 hp system output (Jazz IV, HR-V III)[4][8]
With cautionVersions to be cautious about
  • 1.0 GSE T3 Turbo 100-120 hp (FireFly, since 2018)[1][2]
  • i-MMD 2.0 184 hp system output (CR-V V hybrid)[4][5]
  • e:HEV 2.0 184 hp system output (Civic XI)[5][12]
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

Honda e:HEV / i-MMD

Other comparisons

With the 1.0 T3 and 1.3 T4 FireFly Turbo

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 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. Sistema híbrido Honda e:HEV (i-MMD): problemas, fiabilidad y coches que lo llevanMotordex · Technical documentation · consulted 29 October 2026 · in Spanish
  5. 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
  6. Fiabilité Honda HR-V (2022): pannes et témoignagesFiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
  7. Fiat Global Small EngineWikipedia (inglés) · Other source · consulted 29 October 2026
  8. Honda LEB-H5 (1.5 i-MMD e:HEV): experiencias, problemas, consumo y consejos de compraAutohints · Technical documentation · consulted 29 October 2026 · in Spanish
  9. Problemas Jeep CompassTotal Renting · Other source · consulted 29 October 2026 · in Spanish
  10. Jeep Renegade Problemecarwiki.de · Other source · consulted 29 October 2026 · in German
  11. Jeep Renegade 4xe plug-in hybrid reliability and safetyDriving Electric · Motoring press · consulted 29 October 2026
  12. 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