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Check engine light on 2000 Mercedes-Benz S430

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My check engine light came on. How can i check what is wrong or what does it mean? The light is still on and it came on about 3:30p.m. mst 03/21/2010
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You just need a code reader plugged into your car. Go to a parts store and ask them to run a scan on your car and then they can tell u what it says.
most likely a sensor. It usually is an O2 sensor. Check fluids to be safe, then run the code when you can.