Many 1995 Buick Regals have the newer OBDII (On Board Diagnostic version 2) computer. To obtain fault "codes" saved by it, it requires connection to an OBDII scanner. If you have the older pre-OBDII (let's call it OBDI) you don't need a scanner. Read on..
Beginning in 1994, vehicles were transitioning from the older OBDI computer and by a 1996 - nearly all were OBDII. The nice thing about OBDI, was that with a simple paper clip, you could get the OBDI computer to display the code as flashes of the Check Engine light on the dash. No special scanner required. This was more of a benefit in the early years of OBDII - now you can drive to any Autozone (and many other auto parts store) and they will scan the OBDII computer for you at no cost. They can also tell you what the "code" actually means so that you will know why the indicator is on - and just maybe - even how to fix it, too.
If you've been told you have / you're sure you've got an OBDI computer, here's what to do: find the terminal jack - usually under the dash - below the steering wheel. The pinouts for 1995 GMC's are below. You're going to be connecting terminal "B" to "A" (the top RIGHT most two terminals). Check the video on the other side of this picture for full details.
Here's a Youtube video that shows how it's done on a Saturn. It's the same for your Buick Regal - with an OBDI terminal. It will NOT work for an OBDII terminal.
Good luck!
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