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The yellow triangle with an exclamation mark will typically be accompanied by a message explaining what's gone wrong. Hopefully it will be self-explanatory - such as a low reservoir for the windscreen washer system.
There are way too many to list. The main reason it comes on is there is an emission failure of some kind. I assume when you say engine management you mean check engine light. Or the light with the picture of the engine and exclamation mark or a red triangle in the case of a hybrid.
Engine management light, some problem in engine, might be simple cure, disconnect car battery for ten mins , might reset it, if not dealer or guy with diagnostics can reset
The "Check Engine Light" could be something major, or something as minor as a loose gasoline filler cap. The only way to know is to find someone who canattach an OBD-II code reader to your car's ODB-II computer port and talk to your car's on-board computer,and ask it what it thinks is wrong. Also, the "Yellow light with the triangle that has an exclamation mark in the middle and a circle going around" could be the SES light (Service Engine Soon), which could mean that everything is fine with the car, except the SES light needed to be reset at the 3400Km oil change, but it wasn't. In the U.S., Pep Boys and Advance Auto Parts are national parts store chains that will read the ODB-II codes setting your "Check Engine" light free - don't know who will do this free in Canada/U.K., though.
It is the Tire Pressure Mounted System (TPMS). It monitors the air pressure in your tires. If it is on, you have low tire pressure...or like me, it's just a faulty indicator. Mine came on, but I don't even have TPMS on my vehicle.
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