My "Check Engine" light is on, how do I fix the problem?

Take it to an auto parts store like Autozone. They will hook up a scanner for free, read the code, and clear it for you.

You could unhook the battery cables and it may reset itself. I would have the codes checked first though.

AFTER I REMOVE THE ONE PLUGWIRE THE ENGINE LIGHT COME ON AFTER 30 KM APPROX AND NOW COME AND GO WHY AND WHAT MUST I DO

Just got a oil change....lite was never on before...after oil change it came on