Alternately, you could have intermittent contact in bulb holder due to water leak corrosion or loss of "spring" in contact. Both of these have been observed by members. Latter can be restored by removing bulb and pulling contacts up a little with bent paperclip or needle nose pliers (power off of course).
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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