I own a '95 monte z34 which i absolutely love. Car runs great, but recently, my check engine light has started to come on. OBDII code is P1640 and if i looked right on the internet, that code description is "Driver 1 - input high voltage" What the heck is that??? Any help would be appreciated. Also, I have very large sound system in car - wonderig if it has something to do with code??? I disconnected system and still had light come on, so i don't think it's the cause... Thanks!

It might be in the computer and you do not want to mess with that.Some computer stuff can be a "headache" to do