Rich Posted February 5, 2015 Report Share Posted February 5, 2015 I drove the 1997 Eldorado this morning and noticed the amber Service Engine Soon indicator was illuminated. I shut down, removed and replaced the gas cap and restarted. The indicator remained lit. I ran the codes and found a half dozen which my car seems to have a preference for. I've seen these all before and I just checked them on the OBD II code list, they are all History codes: PCM P0300 H PCM P0603 H PZM B0533 H PZM B1552 H PZM B1558 H MMM B2144 H Since they're all History codes, I understand they will clear themselves at some point. I've seen these all before, maybe multiple times throughout the years so I assume they aren't critical. The car seems to be running great. What I'm wondering is whether the Check Engine Soon indicator will reset itself or do I need to reset it manually? I really hate staring at that indicator while I'm driving. Based on the codes set, would there be any issue in resetting the Check Engine Soon indicator, and if not, how do I reset it? Jimbe 1 Quote Link to comment Share on other sites More sharing options...
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