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Honda e:HEV / i-MMD vs Mitsubishi PHEV: which engine is more reliable?

According to our risk index, the Mitsubishi PHEV carries less risk than the Honda e:HEV / i-MMD: 24/100 (low risk) versus 34/100 (moderate risk). The Honda e:HEV / i-MMD has 2 documented serious faults, the main one being «Cracked high-pressure fuel pump (Honda campaign 6YP)»; 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».

Risk index

Honda e:HEV / i-MMD

34

Moderate risk · 2 serious faults

Risk index

Mitsubishi PHEV

24

Low risk · 2 serious faults

Lower risk

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

14 sourcesHow we work

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.[1][2][3]

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

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.[4][5][6][7][8]

See the 5 of the Mitsubishi PHEV faults

Side-by-side comparison

Comparison of Honda e:HEV / i-MMD and Mitsubishi PHEV
Honda e:HEV / i-MMDMitsubishi PHEV
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power109–184 hp163–224 hp
Productionsince 2018[1][9]since 2013[10][11][12]
Reliability
Risk index (what is it?)34Moderate risk24Low risk
Documented faults35
Of high or critical severity22
Worst severityHigh severityHigh severity
Main faults
  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
  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
Most expensive documented repairup to €25012 V battery going flat and hybrid system failing to startPublished figure[1]No reliable data
Which versions to buy
BuyRecommended versions
  • e:HEV 1.5 (LEB-H5) 109-131 hp system output (Jazz IV, HR-V III)[1][9]
  • 2.4 Eclipse Cross PHEV (4B12, 13.8 kWh battery, 2021-2024)[7][8]
With cautionVersions to be cautious about
  • i-MMD 2.0 184 hp system output (CR-V V hybrid)[1][2]
  • e:HEV 2.0 184 hp system output (Civic XI)[2][13]
  • 2.0 Outlander PHEV (4B11, 12 kWh battery, 2013-2018)[6][7][14]
  • 2.4 Outlander PHEV (4B12, 13.8 kWh battery, 2018-2021)[4][5][6]
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

Honda e:HEV / i-MMD

Mitsubishi PHEV

Other comparisons

With the Honda e:HEV / i-MMD

With the Mitsubishi PHEV

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. Sistema híbrido Honda e:HEV (i-MMD): problemas, fiabilidad y coches que lo llevanMotordex · Technical documentation · consulted 29 October 2026 · in Spanish
  2. 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
  3. Fiabilité Honda HR-V (2022): pannes et témoignagesFiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
  4. 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
  5. Mitsubishi Outlander (II & III) – Bekannte Probleme und MängelGebrauchtwagenberater (Alemania) · Motoring press · published 2 March 2023 · consulted 8 October 2026 · in German
  6. Baterías de híbrido enchufable: cuándo habrá que sustituirlas (Outlander PHEV)Autofácil · Motoring press · published 7 May 2020 · consulted 8 October 2026 · in Spanish
  7. DVSA – base de llamadas a revisiónDVSA (Reino Unido) · Other source · consulted 8 October 2026
  8. 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
  9. Honda LEB-H5 (1.5 i-MMD e:HEV): experiencias, problemas, consumo y consejos de compraAutohints · Technical documentation · consulted 29 October 2026 · in Spanish
  10. Mitsubishi Outlander PHEVWikipedia (inglés) · Other source · consulted 8 October 2026
  11. Mitsubishi OutlanderWikipedia (alemán) · Other source · consulted 8 October 2026 · in German
  12. Mitsubishi 4B1 engineWikipedia (inglés) · Other source · consulted 8 October 2026
  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
  14. 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