If the defect mentioned above is discovered in combination with the fault codes described, a faulty oil trap (figure) in the crankcase ventilation at the cylinder head cover may be a possible cause.
There are pressure control and check valves installed in the oil trap housing. They regulate the suction of the blow-by gases according to the engine speed and the pressure ratio. An error in this area can cause speed fluctuations and a higher consumption of oil. In some cases, the vehicle switches off right after it is started.
The oil trap must be completely replaced in the event of damage as it cannot be disassembled or cleaned.
Please observe the repair notes issued by the relevant vehicle manufacturers in this context.
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.