If a customer complains about the above error, this could be caused by the EGR valve. Error code P0400 (exhaust gas recirculation system, continuity malfunction identified) may be saved in the event memory. Coking and other deposits cause the valve to jam. In this case, proceed as follows:
- Remove the EGR valve and clean it thoroughly with appropriate products.
- If contamination is severe, the exhaust manifold must also be removed and cleaned.
- After cleaning, refit the parts that have been removed with new seals.
- Carry out a system check.
- Delete the event memory.
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.
Not helpful at all
Very helpful