Hey everyone, I just learned how to check my 91 deville for codes using the off+warmer buttons via instructions on this site. I also read some info about being able to access all kinds of neat info using this "diagnostics mode" like sensor voltages, temperatures, etc. Most of this info seemed to be applicable to North* cars only and I was wondering if someone could let me know what im able to do in my 91. ANY info thats applicable to my 91 is appreciated. Thanks.