Mazda CX5 - warning message "System check required" and error code P06DE read out

If the error message "System check required" is displayed in the instrument cluster on the above-mentioned vehicle models and at the same time the error code P06DE is read out, this could be caused by a defect in the injector seals. As a result of thermal loads, the injectors can loosen over time, a situation which leads to a reduction in the sealing pressure.

In this case, combustion gases escape at the injector sealing discs and enter the valve cover through the injector shaft. These exhaust gases then mix with the engine oil there and form a carbonaceous residue. Such impurities in turn enter the oil circuit and clog the intake pipe or the filter element (strainer) of the oil pump. The resulting drop in oil pressure is recognised by the switch and stored as an error code in the error memory.

If, during troubleshooting, no defect has been diagnosed with the oil pressure switch or in the engine lubrication system, the injector seals and the filter element should be checked and replaced if necessary. At the same time, the sediments/deposits are to be removed and the engine oil replaced.

Please always observe the maintenance and repair instructions provided by the vehicle manufacturer when carrying out such work!

This defect may also occur in other vehicle models that have the same type of engine design/equipment.

Reprinting, distribution, reproduction, exploitation in any form whatsoever or disclosure of the contents of this document, even in part, is prohibited unless our express permission has been obtained in writing beforehand and the source is stated. The schematic illustrations, pictures and descriptions are provided for explanatory purposes and are only intended as a visual supplement to the document text, so they cannot be used as the basis for installation or assembly work. All rights reserved.