On September 15, 2017 Siskinds LLP filed a proposed class action lawsuit against BMW related to certain car models containing the N2O engine.

The proposed action alleges that BMW vehicles equipped with the "N20" engine contain defects in the primary and secondary assembly chains. It is alleged that these defects cause the chains to wear out prematurely, resulting in costly repairs borne by the proposed class.

The action seeks to represent all persons who purchased or leased a BMW vehicle containing the N20 engine during the period between 2012-2015.