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Since your check engine light can indicate any one of a number of issues, it can be difficult to determine the nature of the problem right off the bat. Experts strongly recommend that you have your car checked by a certified repair technician as soon as possible whenever your check engine light goes on. Even if your car appears to be all right, ignoring the problem could lead to engine failure or some other form of system failure. It is in your best interest to let experts determine the source of the problem, since the issue could be as minor as an improperly replaced gas cap or as complicated and as serious as engine or transmission malfunction. Certified repair technicians have the knowledge and the resources essential to a proper diagnosis.