If the onboard computer of your Mini Cooper detects any kind of malfunctions in the engine, then it would turn on the check engine light on the dashboard to warn the driver about the concerned problems. Leaving such problems untreated for a long period could cause irreparable damages to the system which might cost you a lot. So, efforts should be made to detect and repair the faults in the system responsible for the illumination of the check engine light. Have a look at the slide to get a deeper knowledge in this regard.