Also keep in mind that for the very first data logging frame or if you are in monitor mode, there is no previous frame, so Obdii.CurrentFrame - 1 is invalid. You may want to handle this situation in your script.

 

This is the one I bought last week.

http://shop.advanceautoparts.com/web..._T|GRP2018____

Easy to get the codes but I am still figuring out the readings on the sensors during a drive test. It also lets you reset the codes. Supposedly, it does everything except ABS codes. However, I have AIRBAG light on and there are no codes pulling from the computer for the airbag.

 

I would love to know how to pull ABS and air bag codes. If you run across anything let us know.

 

I know it can't do ABS codes but I am not sure about the Airbag system and how it works with the computer. Does the airbag system even set codes? I don't know. I did, however ask about this code reader and the airbag. The person I was talking to did tell me that this particular scanner would do everything EXCEPT ABS. This is the first one I have ever used and am just getting my feet wet with the electronic diagnosis of a vehicle.