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Will need to have it daignosed by a professional and perform repair that is needed.
The "check engine" light is on because of a problem that the computer has sensed within the sensors of a faulty circuit.
The triangle is on because the problem is also effecting other modules within the vehicle.
Perform diagnostics to determine problem and repair problem..
It means you need to find out what codes you have. Auto Zone and other retail stores will scan your computer and give you the codes it has for free. Write them down and post them here so we can help you. The car probably just needs a tune up.
It indicates that the vehicle's computer has recorded a code in the memory. It will be a malfunction code of some sort. A code reader tool is connected to the diagnostic connector under the dash to retrieve the code, which gives information as to which engine management system has experienced a malfunction.
Yellow dashboard light: If the light is shaped like a triangle with an apostrophe, then there is likely an issue with your Automatic Stability Control or Automatic Braking System.
This can also be caused by a wheel speed sensor. It is highly recommended that you take the vehicle to your dealer as this is a safety related issue.
Regarding the "skunky smell" (sulfur dioxide, rotten eggs):
If not related to the in-dash lights, then I suspect the engine is running too rich. Check the oxygen sensor signal to the ECU to determine if it is switching normally. The engine has to run a while to get the catalytic converter hot enough to function properly. If the O2 sensors on either side of the converter is getting a bad signal, then the engine will burn too rich and eventually clog the converter.
Just about any autoparts store can read the problem code for free so just drop by one and let them give you the code, then let us know what you find.