Mercedes-Benz A-Class W177 — Reliability
Reliability Summary
Engine
OM654 — 76/100
ACCEPTABLE
Known Issues
6
Engine in this model
Known Issues Across All Engines
| Issue | Engine | Severity |
|---|---|---|
| Roller rocker arm wear (engines built before mid-2018) | OM654 | high |
| Timing chain stretch (chain at the gearbox end) | OM654 | high |
| Coolant pump can leak into the vacuum system (recall, fire risk) | OM654 | moderate |
| Particulate filter and EGR clogging, oil diluted by diesel (short trips) | OM654 | moderate |
| Crankshaft out of specification (recall, engines built July-December 2020) | OM654 | minor |
| Oil leak at the front crankshaft seal (vibration damper) | OM654 | minor |