A lot depends on your vehicle history, what kind of vehicle you have and what engine and transmission your vehicle is equipped with. If this information is not provided, it is hard to say what your vehicle needs at 100,000 miles.
Your engine computer has turned the Service Engine Soon light on because there is a malfunction in one of the many systems that are monitored by the computer. The only way to find out which one, or WHY the light is on, is to scan your engine computer to find out why it has turned the light on. There will be a fault code stored in your computer. This light coming on has very little to do with maintenance schedules. It has more to do with SYSTEM MALFUNCTIONS. (Although many system malfunctions CAN be prevented by performing the scheduled maintenance.)
Take it to autozone for a free check engine light dignosis its free and quick you have a faulty sensor somewere probably o2 sensor
if it helps please leave me a good rating
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