I'm not conversant with your mods, but CELs can appear for a zillion reasons and it may be coincidental. You can have code read as a starting point, ignore and see if it goes away, or reset PCM and see if it returns.
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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