Can a bad gas cap cause a check engine light?
Can a bad gas cap cause a check engine light? The gas cap is a part of the vehicle’s evaporative emissions system and can cause problems with the system if it has an issue. An improperly sealing fuel cap may cause an evap system leak, which will set off the Check Engine Light when the the computer detects the leak. What happens if you have a bad gas cap? A bad or failing fuel cap will not necessarily cause major performance issues, but it can set off the Check Engine Light, which will prevent the vehicle from passing an emissions...