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Honda e:HEV / i-MMD vs Rover K-Series: which engine is more reliable?

According to our risk index, the Honda e:HEV / i-MMD carries less risk than the Rover K-Series: 34/100 versus 46/100 (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 Rover K-Series has 2 documented serious faults, the main one being «Head gasket failure».

Risk index

Honda e:HEV / i-MMD

34

Moderate risk · 2 serious faults

Lower risk

Risk index

Rover K-Series

46

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 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 Rover K-Series reliable?

The Rover K-Series has one very well-known fault: the head gasket, which according to Diariomotor can fail at under 100,000 km and which technical sources link to a small cooling circuit and a badly placed thermostat. The usual repair uses the multi-layer (MLS) gasket developed for the Freelander; the other two documented faults (sunken liners and coolant leaks) are related to that same circuit.[4][5][6][7]

See the 3 of the Rover K-Series faults

Side-by-side comparison

Comparison of Honda e:HEV / i-MMD and Rover K-Series
Honda e:HEV / i-MMDRover K-Series
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainTiming belt (dry)
Power109–184 hp60–160 hp
Productionsince 2018[1][8]1990–2005[5][9]
Reliability
Risk index (what is it?)34Moderate risk46Moderate risk
Documented faults33
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. High severity: Head gasket failure
  2. High severity: Sunken cylinder liners and warped head after overheating
  3. Medium severity: Coolant leaks: expansion tank cap, rear block rail and hoses
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][8]
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][10]
  • 1.1 K8 60 hp / K16 75 hp (Rover 25, 1998-2005)[4][7]
  • 1.4 8V/16V 74-103 hp (14K2F / 14K4F, 1995-2005)[4][6]
  • 1.6 16V 109-116 hp (16K4F, 1995-2005)[4][6]
  • 1.8 16V 117-136 hp (18K4F, 1995-2005)[4][6][11]
  • 1.8 VVC 145-160 hp (18K4K, 1995-2005)[11][12]
  • 1.8 T turbo 150-160 hp (18K4T, 2002-2005)[4][7]
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

Rover K-Series

See the 12 models with the Rover K-Series

Other comparisons

With the Honda e:HEV / i-MMD

With the Rover K-Series

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. Guía de compra del MG TF de segunda manoDiariomotor · Motoring press · published 7 November 2023 · consulted 8 October 2026 · in Spanish
  5. MG TF (2002)Wikipedia (en) · Other source · consulted 8 October 2026
  6. Choosing the correct K Series Head Gasket KitDMGRS · Technical documentation · consulted 8 October 2026
  7. Cooling and heating (K-Series: ZR, ZS, ZT, MGF, TF)MGOC Spares · Technical documentation · consulted 8 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. Rover K-series engineWikipedia (en) · Other source · consulted 8 October 2026
  10. 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
  11. MG ZR ZS ZT & Modern Engine & FuelMGOC Spares · Technical documentation · consulted 8 October 2026
  12. MGF & TF Headgasket Repair KitsMGOC Spares · Technical documentation · consulted 8 October 2026