Noise and/or Smoke From Drive Belt Area on Mercedes-Benz E420

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 172,000 (172,000–172,000)
2 model years affected: 1994, 1997
2 people reported this problem
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Rattling noise and smoke from the belt, generally during startup and goes away while driving. Need to replace the AIP.