What does the "service vehicle" warning light mean and what do I do about it? on 2004 Saturn Ion

The light has just started coming on today. It stays on.

If I need a iagnostic code how do I find it?

Also, It has started vibrating when I apply my brakes. What is causing that?

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1 answer
go to auto zone and they will scan for free, then post codes so we can adv