My set of service manuals go to 2004, so this may be a new code for 2005. I think it was 2002 that NSX's were ULEV certified and have an air pump to add air to the exhaust stream. They may have added this code for that system in the 2005 model year.
First thing is I think you are OK to drive it. Since it is a 2005, back to the dealer it goes. It can be a fuse, bad motor, split hose, etc. It will be warranty work.
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