Don't remember exactly how accurately. I used to check the tps and iac sensors and didn't pay attention to the rest much. It has been about 7 yrs since I tried it too. Sorry I am not much help. You'll have to try it. I know they offer the scanmaster for other vehicles of which on is the 82-92 camaro. Seen one on eBay for cheap years ago but didn't get it. By cheap I mean half the price of the GN 2.1 version.