Smart ForTwo W451 — Reliability

W451 2008–2014 1 engine

Reliability Summary

Engine M132 (3B21) — 66/100 CAUTION
Known Issues 6

Engine in this model

CAUTION 66

M132 (3B21)

1.0 NA / Turbo

Mitsubishi-built 1.0 three-cylinder (3B21) in the Smart Fortwo 451: 61-71 hp naturally aspirated, 84...

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Known Issues Across All Engines

Issue Engine Severity Onset
Clutch / shift actuator failure (automated gearbox) M132 (3B21) high —
Oil leaks (valve cover, spark plug wells, crankcase ventilation) M132 (3B21) moderate —
SAM unit (fuse box / control module) water damage M132 (3B21) moderate —
Drive belt wear (mhd) - water pump stops, engine overheats M132 (3B21) moderate —
Burnt exhaust valves / low compression M132 (3B21) moderate —
Heater coolant shut-off valve short circuit (recall) M132 (3B21) minor —