How To - Diagnose a check engine light

When the electrical system on your car starts acting up you'll find yourself facing a check engine light. When this happens your car might go into a "limp mode" or limited operation mode. The car does this to protect itself from further damage until the problem is rectified and the error causing the check engine light. You don't really have many options and will have to seek the services of a diagnostic technician who can help you.