Audi Q5 - fejl i SCR-systemet

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.