Mercedes-Benz E420 Problem Report
Mercedes-Benz E420 Noise and/or Smoke From Drive Belt Area
The emissions air injection pump can seize, causing a loud squealing noise followed by smoke from the drive belt. If the engine is not turned off, the belt will break, turning on the alternator/battery warning light.
Rattling noise and smoke from the belt, generally during startup and goes away while driving. Need to replace the AIP. - yash
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