Nice one...... welcome to the world of Lexus :) as for the error code, i think you may find the code is in error since they all do that
In fact the Director of Lexus GB said in a statement recently that his entire team of experts which is Dave, Dave's mate Bob, Bob's wife and the lady she walks the dog with but not on Sundays, unless Dave wife is ill and Bob walks the dog and then Dave's wife does walk the dog on a Sunday ..... That when the error code appears it suggests that it's broke.
On the bright side they said any future use whilst broken will not be detrimental to the experience you already have :)