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Mercedes Benz - Engine power loss | HELLA

Mercedes Benz

Type: M-Class (W164) E-Class

(W211) S-Class (W221), GL (X164).

Engine: OM 629 (420 CDI)

Engine power loss

Crankshaft sensor

Crankshaft position sensor

On vehicles with OM 629 engines, the possibility exists that there is a loss of engine power. The reason for this may be an electrical interruption in the crankshaft sensor.

The vehicle manufacturer is already aware of the problem. As part of a service campaign, the vehicles will be checked and the crankshaft sensors will be replaced.

Nevertheless, one may assume that for various reasons not all vehicles have been checked and repaired.

Please note this information in the wake of complaints in connection with engine power loss and possible malfunction "engine cannot be started".

Important safety notice
The following technical information and tips for practical use have been set up by HELLA in order to offer professional support to automotive workshops in their daily work. The information available here on this website is only to be used by appropriately trained specialist staff.

The reprinting, distribution, reproduction, exploitation in any form and disclosure of the contents of this document, even in part, is prohibited without our express written approval and indication of the source. The schematic illustrations, figures and descriptions are for explanation and presentation of the document text and cannot be used as a basis for installation or design. All rights reserved.