Honda Repair: PO 401 code on 97 Honda Prelude, honda prelude sh, honda prelude

Question
Had 105K service done. Noticed engine ligts and ATTS light on afterwards. Tech says he knocked off vacuum hose and put back on. Lights went out for short while. Put in new EGR valve according to the code showing PO 401. Both lights back on already. I'm in to this $260.00 and soething is still wrong. Can that temporary loss of vacumm be causing something and what does all this have to do with the ATTS. Special steering for SH models. Thank you very much !997 Honda Prelude SH

Answer
The ECU might need to be resetted I would do that first since he did put the vacuum hose back on. I wouldn't really know why the ATTS light comes on never worked with the SH models not a big fan of them but try resetting everything and check the trouble codes that the ECU is kicking out.