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Honda e:HEV / i-MMD vs M111: which engine is more reliable?

According to our risk index, the Honda e:HEV / i-MMD carries less risk than the M111: 34/100 versus 38/100 (both 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 M111 has no documented serious faults.

Risk index

Honda e:HEV / i-MMD

34

Moderate risk · 2 serious faults

Lower risk

Risk index

M111

38

Moderate risk · 0 serious faults

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

8 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 M111 reliable?

The M111 is the four-cylinder petrol engine Mercedes-Benz fitted from 1992 to 2006 in the C-Class (W202 and the early years of the W203), the E-Class (W210), the CLK (C208), the SLK (R170) and the Sprinter, in naturally aspirated form and with a mechanical supercharger (Kompressor). A German used-car guide describes it as reliable when well maintained, with limited weak points: the head gasket and an oil leak into the camshaft adjuster wiring.[4][5]

See the 5 of the M111 faults

Side-by-side comparison

Comparison of Honda e:HEV / i-MMD and M111
Honda e:HEV / i-MMDM111
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power109–184 hp122–197 hp
Productionsince 2018[1][6]1992–2006[4][7]
Reliability
Risk index (what is it?)34Moderate risk38Moderate risk
Documented faults35
Of high or critical severity20
Worst severityHigh severityMedium 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: Head gasket failure with coolant loss
  2. Medium severity: Camshaft adjuster oil leak into the wiring
  3. Medium severity: Mechanical supercharger (Kompressor) wear at high mileage
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][6]
None
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][8]
  • M111 naturally aspirated 1.8/2.0/2.2/2.3 (E18/E20/E22/E23)[4][5]
  • M111 Kompressor 2.0/2.3 (E20 ML/E23 ML)[4][5]
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

M111

Other comparisons

With the Honda e:HEV / i-MMD

With the M111

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. Mercedes-Benz M111 engineWikipedia · Other source · consulted 27 September 2026
  5. Mercedes M111: Typische Probleme und HaltbarkeitGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  6. Honda LEB-H5 (1.5 i-MMD e:HEV): experiencias, problemas, consumo y consejos de compraAutohints · Technical documentation · consulted 29 October 2026 · in Spanish
  7. Mercedes-Benz M 111Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  8. 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