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BMW M54 vs Honda e:HEV / i-MMD: which engine is more reliable?

According to our risk index, the Honda e:HEV / i-MMD carries less risk than the BMW M54: 25/100 (moderate risk) versus 54/100 (high risk). The BMW M54 has 2 documented serious faults, the main one being «Thermostat and water pump failure»; the Honda e:HEV / i-MMD has 1 documented serious fault, the main one being «Cracked high-pressure fuel pump (Honda campaign 6YP)».

Risk index

BMW M54

54

High risk · 2 serious faults

Risk index

Honda e:HEV / i-MMD

25

Moderate risk · 1 serious fault

Lower risk

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

9 sourcesHow we work

Is the BMW M54 reliable?

The BMW M54 (2000-2006) is a naturally aspirated petrol inline-six with a reputation for longevity, passing 200,000 km if maintained. Its weak points are the crankcase ventilation valve and the plastic cooling system; check that they have been renewed.[1][2][3]

See the 5 of the BMW M54 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]

See the 2 of the Honda e:HEV / i-MMD faults

Side-by-side comparison

Comparison of BMW M54 and Honda e:HEV / i-MMD
BMW M54Honda e:HEV / i-MMD
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power170–235 hp109–184 hp
Production2000–2006[6][7]since 2018[4][8]
Reliability
Risk index (what is it?)54High risk25Moderate risk
Documented faults52
Of high or critical severity21
Worst severityHigh severityHigh severity
Main faults
  1. High severity: Thermostat and water pump failure
  2. High severity: Cracked expansion tank and coolant leak
  3. Medium severity: Cracked crankcase ventilation valve (CCV) and oil consumption
  1. High severity: Cracked high-pressure fuel pump (Honda campaign 6YP)
  2. 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 versionsNone
  • e:HEV 1.5 (LEB-H5) 109-131 hp system output (Jazz IV, HR-V III)[4][8]
With cautionVersions to be cautious about
  • 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][9]
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

BMW M54

Honda e:HEV / i-MMD

Other comparisons

With the BMW M54

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. BMW M54 Engine Guide: Reliability, Common Problems & Tuning PotentialEuro Premium Parts · Technical documentation · consulted 5 October 2026
  2. Il motore da 6 cilindri che supera agilmente i 300.000 kmAutoblog.it · Motoring press · published 13 February 2026 · consulted 5 October 2026 · in Italian
  3. BMW M54 reliabilityAutoscore · Other source · consulted 5 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. BMW M54Wikipedia (inglés) · Other source · consulted 5 October 2026
  7. BMW M54Wikipedia (alemán) · Other source · consulted 5 October 2026 · in German
  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. 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