When the "check engine" light turns on while driving, the manual typically says you have to bring it to the manufacturer for check-up.
There are a few reasons why this light turns on.... One of them is that the computer box could be defective or intermittent, which means that the right mix of air and fuel is compromised. In some of the vehicles, it automatically puts the vehicle into limp mode,- meaning that you can only travel at low speed..... Do not ignore it. It could mean/result to bigger worries.