Ok, so I read over the post listing the service codes and how to determine them (https://dodgeforum.com/fb.asp?m=63384), but I still have a problem. First off, I have a 97 Ram 4x4. Now, the number's that I got were -122156 or 122155. The discrepancy is that on the very last set of flashes, the light came on and stayed on, so I don't know if I should count it or not. But still, are these 3 different codes, or is there another, more comprehensive list somewhere? Or should I just go toAutoZone and have them hook it up? Thanks.