If the defect described above is determined in conjunction with error code P0401 being read out from the control unit, the cause could be a contaminated exhaust gas recirculation cooler.
On this engine type (R), the EGR valve does not become too polluted from condensing steam and coking, instead combustion residues can contaminate or block the EGR cooler.
Repair note
Remove the EGR cooler and clean with a suitable cleaning agent depending on the contamination level.
If it is no longer possible to clean the EGR cooler, it must be replaced.
Please observe the vehicle manufacturer's repair and maintenance instructions in this regard.
This defect may also occur in other models from this manufacturer with the same engine.
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or 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, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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