Mercedes-Benz A-Class W169 — Reliability

W169 2004–2009 1 engine

Reliability Summary

Engine M166 — 55/100 CAUTION
Known Issues 1

Engine in this model

CAUTION 55

M166

M166 A-Class 1.4/1.6

W168 A-Class. Infamous moose test rollover era. Engine itself is adequate but head gasket failures c...

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Known Issues Across All Engines

Issue Engine Severity Onset
Head gasket failure M166 high 60,000 km – 120,000 km