all you need is a paper clip to read the check engine codes. i have done this many time over the years with great sucess. heres a cheat sheet and where to make the connection with the paper clip. yes just a paper clip is all thats needed.


http://www.troublecodes.net/GM/

Thanks for posting, but none of that is helpful on the Alero forum. On that link that you posted, it says that all OBDII vehicles require a scanner and that technique only works on pre-96 models. All Alero's are 1999 or newer.

Jeremy