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: 34/100 (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 2 documented serious faults, the main one being «Cracked high-pressure fuel pump (Honda campaign 6YP)».

Risk index

BMW M54

High risk · 2 serious faults

Risk index

Honda e:HEV / i-MMD

Moderate 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

Reviewed on 30 October 202610 sources How 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][6]

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

Side-by-side comparison

Comparison of BMW M54 and Honda e:HEV / i-MMD
Item	BMW M54	Honda e:HEV / i-MMD
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	—	—
Timing	Chain	Chain
Power	170–235 hp	109–184 hp
Production	2000–2006^[7][8]	since 2018^[4][9]
Reliability
Risk index (what is it?)	54High risk	34Moderate risk
Documented faults	5	3
Of high or critical severity	2	2
Worst severity	High severity	High severity
Main faults	High severity: Thermostat and water pump failure High severity: Cracked expansion tank and coolant leak Medium severity: Cracked crankcase ventilation valve (CCV) and oil consumption	High severity: Cracked high-pressure fuel pump (Honda campaign 6YP) High severity: Faulty fuel pump impeller on the 2019-2020 CR-V hybrid (Honda 6FE campaign) Low severity: 12 V battery going flat and hybrid system failing to start
Most expensive documented repair	No reliable data	up to €25012 V battery going flat and hybrid system failing to startPublished figure^[4]
Which versions to buy
BuyRecommended versions	None	e:HEV 1.5 (LEB-H5) 109-131 hp system output (Jazz IV, HR-V III)^[4][9]
With cautionVersions to be cautious about	M54B22, 2.2 litres (168-170 hp)^[1][2][3] M54B25, 2.5 litres (189-192 hp)^[1][2][3] M54B30, 3.0 litres (228-235 hp)^[1][2][3]	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][10]
AvoidVersions to avoid	None	None

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

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Sources

Every fact on this page links to its source. If you find an error, let us know.

BMW M54 Engine Guide: Reliability, Common Problems & Tuning PotentialEuro Premium Parts · Technical documentation · consulted 5 October 2026
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
BMW M54 reliabilityAutoscore · Other source · consulted 5 October 2026
Sistema híbrido Honda e:HEV (i-MMD): problemas, fiabilidad y coches que lo llevanMotordex · Technical documentation · consulted 29 October 2026 · in Spanish
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
Fiabilité Honda HR-V (2022): pannes et témoignagesFiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
BMW M54Wikipedia (inglés) · Other source · consulted 5 October 2026
BMW M54Wikipedia (alemán) · Other source · consulted 5 October 2026 · in German
Honda LEB-H5 (1.5 i-MMD e:HEV): experiencias, problemas, consumo y consejos de compraAutohints · Technical documentation · consulted 29 October 2026 · in Spanish
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