Awasome Possible Reasons My Check Engine Light Is On References. Emission problems are the most common problems which are detected by the check engine light. Web below we have highlighted the most common causes of a check engine light.
Your check engine light is on because your vehicle has an issue with one of the systems related to the engine or the engine itself. Your gas cap is loose, broken, or simply missing. The only method to know the reason as to why the check engine light is on is getting it scanned by an obd reading device.
