Why did my Mercury Sable 2002, engine light come on yesterday when I started my car?

vanessa

New member
It started shaking a little when I turned it on and the light came on, so I quickly turned it off and started it and it was fine. I went and put transmittion fluid in it , because it seemed low and motor oil cause that was a little low too. But the light is still on. Should I be worried? Is there a problem with my transmission? Help!
 
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