After receiving an unspecified number of complaints in China, BMW has reportedly started a "full investigation" into what may be a defective part in its VANOS engine control system. BMW said via a Chinese blog that it would file a recall application with the the General Administration of Quality Supervision, Inspection and Quarantine in China.BMW has not yet announced how many vehicles will be recalled , or which models the potential recall might cover. We're also curious as to whether the VANOS issue could extend into markets outside of China.We've placed a call with BMW in the United States, and will update this post as soon as we hear back. Stay tuned for more, and if you're curious about what VANOS is and how it works, scroll down below for a video animation.