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Hello welcome to just answer I am master tech and will be able to assist you today.
can you give me the year and model of your honda ?
now this P0401 is caused by a restricted egr flow and the intake upper plenum will need to be removed and cleaned out, in order to perform some basic testing to confirm this and update the pcm you will need to have the Honda scanner to perform this task
now your battery light is whats flashing ?
here is the egr update kit that we were installing years ago but you can still purchase the parts in the kit form but will still need to drill the intake out as described in the bulletin.
no recall on this only a bulletin. I posted it on the last reply.
its a very easy task to do.
as far as a recall on the multiplex there is nothing .
have you done a self test on the multiplex yet ?