just curious if any of you guys have any information on the 04 cavalier's ODB2 interface..  I know there are 3 or more protocols, (ELM/etc)  
I'd like to get an adapter (serial or USB) to plug into a laptop or computer, and don't want to pay hundreds of dollars...  anyone know where to get one ?
thanks for any info!
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Cavillac
 
I saw one at Sears the other day for $100 or so.  Not listed on their site, but it was an OBD2 interface w/ USB cable.  Didn't check if it worked for Cavi's/Fires.  More so just saw it on my trip to get a brake cylinder honer.
 
 
you can make a cable with a db9 connector that will plug into the serial port of a computer. instructions are somewhere online. from that point its just a matter of getting some software
14.82 @ 97 mph
 
wut if i have a cable, what software is available?