Skip to content
MotorFiable

Honda e:HEV / i-MMD vs Porsche V8 and V6 (Cayenne and Panamera): which engine is more reliable?

According to our risk index, the Honda e:HEV / i-MMD carries less risk than the Porsche V8 and V6 (Cayenne and Panamera): 34/100 (moderate risk) versus 55/100 (high 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 Porsche V8 and V6 (Cayenne and Panamera) has 5 documented serious faults, the main one being «Cracked plastic coolant pipes on the Cayenne V8».

Risk index

Honda e:HEV / i-MMD

34

Moderate risk · 2 serious faults

Lower risk

Risk index

Porsche V8 and V6 (Cayenne and Panamera)

55

High risk · 5 serious faults

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

24 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 Porsche V8 and V6 (Cayenne and Panamera) reliable?

There are no public failure statistics for these engines. The sources agree on three points: the plastic coolant pipes of the first Cayenne V8s, cylinder bore scoring in the naturally aspirated 4.5, and the timing chain of the VR6 V6s. On the 4.8 and the Panamera, the camshaft adjuster bolts (a 2012 workshop campaign) and leaks weigh more.[4][5][6][7][8][9][10][11]

See the 7 of the Porsche V8 and V6 (Cayenne and Panamera) faults

Side-by-side comparison

Comparison of Honda e:HEV / i-MMD and Porsche V8 and V6 (Cayenne and Panamera)
Honda e:HEV / i-MMDPorsche V8 and V6 (Cayenne and Panamera)
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power109–184 hp250–570 hp
Productionsince 2018[1][12]2002–2017[4][13][14][15]
Reliability
Risk index (what is it?)34Moderate risk55High risk
Documented faults37
Of high or critical severity25
Worst severityHigh severityCritical 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: Cracked plastic coolant pipes on the Cayenne V8
  2. High severity: Timing chain stretch on the Cayenne VR6 V6 engines
  3. Critical severity: Cylinder bore scoring in the Cayenne 4.5 V8 block
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][12]
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][16]
  • 3.2 V6 VR6 250 hp (Cayenne I, 2004-2007)[6][7][17]
  • 3.6 V6 VR6 FSI 290 hp (Cayenne I, 2007-2010)[6][7][18]
  • 3.6 V6 VR6 300 hp (Cayenne II, 2010-2017)[17][19]
  • 4.5 V8 S 340 hp (M48.00, Cayenne I, 2002-2007)[4][5][6][8]
  • 4.5 V8 Turbo 450 hp and Turbo S 521 hp (M48.50, Cayenne I, 2002-2007)[4][5][6][8]
  • 4.8 V8 S 385 hp and GTS 405 hp (M48.01, Cayenne I, 2007-2010)[6][7][18]
  • 4.8 V8 Turbo 500 hp and Turbo S 550 hp (M48.51, Cayenne I, 2007-2010)[18][20]
  • 4.8 V8 S 400 hp, GTS 420 hp, Turbo 500/520 hp and Turbo S 550/570 hp (Cayenne II, 2010-2017)[9][10][19][21]
  • 3.6 V6 300/310 hp (Panamera and Panamera 4, 2010-2016)[9][13][22][23]
  • 4.8 V8 S, 4S and GTS 400-440 hp (M48.20, Panamera, 2009-2016)[9][11][23]
  • 4.8 V8 Turbo and Turbo S 500-570 hp (M48.70, Panamera, 2009-2016)[9][23][24]
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

Porsche V8 and V6 (Cayenne and Panamera)

Other comparisons

With the Honda e:HEV / i-MMD

With the Porsche V8 and V6 (Cayenne and Panamera)

Compare other engines

That is the comparison you are viewing: change one of the two engines.

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. Porsche Cayenne (generaciones 955/957 y 958, motores y problemas conocidos)Wikipedia (inglés) · Other source · consulted 9 October 2026
  5. Alusil (aleación de aluminio y silicio para cilindros)Wikipedia (inglés) · Other source · consulted 9 October 2026
  6. Gebrauchtwagen-Kaufberater: Was kann der Porsche Cayenne 9PA?AutoScout24 · Motoring press · published 10 January 2022 · consulted 9 October 2026 · in German
  7. Porsche Cayenne I 9PA - Probleme und KrankheitenGebrauchtwagenberater · Motoring press · consulted 9 October 2026 · in German
  8. Buying, owning, improving the Porsche Cayenne 958Car Mechanics · Motoring press · published 24 September 2025 · consulted 9 October 2026
  9. Part 573 Safety Recall Report 17V-368 (Porsche AH08, reguladores de los árboles de levas)NHTSA / Porsche Cars North America · Official body · published 21 February 2023 · consulted 9 October 2026
  10. Amended Chronology For Recall AH08 (cronología de la campaña de los reguladores de levas)Porsche Cars North America (documento en NHTSA) · Manufacturer · published 20 July 2017 · consulted 9 October 2026
  11. 1st Gen Porsche Panamera Buyer's GuideStuttcars · Other source · consulted 9 October 2026
  12. Honda LEB-H5 (1.5 i-MMD e:HEV): experiencias, problemas, consumo y consejos de compraAutohints · Technical documentation · consulted 29 October 2026 · in Spanish
  13. Porsche Panamera (primera generación, 970)Wikipedia (inglés) · Other source · consulted 9 October 2026
  14. Porsche-Achtzylindermotoren: historia de los V8 de PorschePorsche Newsroom · Manufacturer · consulted 9 October 2026 · in German
  15. Porsche V8 engines (familia M48)Wikipedia (inglés) · Other source · consulted 9 October 2026
  16. 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
  17. Probleme mit dem Porsche Cayenne (9PA y 92A) inklusive RückrufaktionenCarWiki.de · Other source · consulted 9 October 2026 · in German
  18. Fiabilité Porsche Cayenne (2002-2010): pannes et témoignagesfiches-auto.fr · Owners' forum · consulted 9 October 2026 · in French
  19. Fiabilité Porsche Cayenne 2 (2010-2017): pannes et témoignagesfiches-auto.fr · Owners' forum · consulted 9 October 2026 · in French
  20. Porsche Cayenne 4.8 500 ch 2012: moteur cassé, vis d'arbre à cames desserrée à 147.000 kmfiches-auto.fr · Owners' forum · published 9 May 2018 · consulted 9 October 2026 · in French
  21. Porsche Cayenne Coolant Pipe Failure: Causes, Symptoms, and Repair CostsForeign Automotive (taller de Ontario, Canadá) · Other source · consulted 9 October 2026
  22. Fiabilité Porsche Panamera (2009-2016): pannes et témoignagesfiches-auto.fr · Owners' forum · consulted 9 October 2026 · in French
  23. 970 Porsche Panamera Common ProblemsYOUCANIC · Other source · published 6 November 2024 · consulted 9 October 2026
  24. DVSA – base de llamadas a revisiónDVSA (Reino Unido) · Official body · consulted 9 October 2026