check engine light--comes on automatically at 75k, a shop told me--also true at 150k?

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I was told when the check engine light came on suddenly 8 yrs ago that Suzuki's were programmed/set to do so, to remind you of 75k maintenance, which I had already done at 50k. (I have taken REALLY good care of my Sidekick, and it has been a really good car, want to keep til it falls apart. But last few years some repairs in the 400-600 range, about one of those per year, incl tune-ups and so on.) Well, the light popped on again and I noticed it shortly after 150k miles. Coincidentally I had just had the exhaust pipes all replaced and the AC recharged. Thanks! May be ready to sell this car b/c I really need a 4WD for winter here--lots of ice storms.