As I understand it, when the check-engine light comes on you get it looked
at immediately. If it is critical and you're continuing to drive around you
may be causing more damage. I'm no mechanic and don't have a diagnostic
tool, but even if I did -- with a brand new car under warranty I'd be right
back to the dealer with it.
If you're lamp is not flashing and the car is operating normally otherwise,
you're probably okay to drive until you can get it checked. Of course, you
should probably plan to do this in the next couple weeks sometime-- don't
make it months.
It's difficult to know what to check without knowing the trouble code.
A very common problem among new Hyundai owners is not tightening the gas
cap sufficiently, which will cause a CEL. Make sure you tighten it until
it clicks several times. If this is the cause, it will take a bit of
driving for the CEL to go out. If you don't think it's the cause, have
it checked. The car is under warranty, so there's no point is fooling
around with it yourself.
Never know with the engine warning light - it can be many things.
Another (relatively, I understand) common cause can be a stuffed oxygen
sensor. Any half decent garage would be able to hook up a unit to the
cars computer and tell you straight away whats causing the error.
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