Smart ForTwo W451 — Reliability

W451 2007–2014 1 engine

Reliability Summary

Engine M132 (3B21) — 52/100 CAUTION
Known Issues 4

Engine in this model

CAUTION 52

M132 (3B21)

1.0 Turbo

Mitsubishi 3B21 heart. Turbo version is peppy but fragile. SAM unit is the real villain. Budget care...

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Known Issues Across All Engines

Issue Engine Severity Onset
SAM unit failure (electrical) M132 (3B21) critical 50,000 km – 120,000 km
Clutch actuator wear (automated manual) M132 (3B21) high 50,000 km – 100,000 km
Turbo actuator failure M132 (3B21) high 60,000 km – 120,000 km
Oil leak (valve cover / sump) M132 (3B21) moderate 40,000 km – 100,000 km