When to go back to check engine light?
When to go back to check engine light? If you are repairing your car to pass emissions then you'll need to drive your car around for about 50 miles so the car's computer can give an accurate reading, otherwise, you'll be wasting your time and they'll tell you to come back after driving it around for an hour. Loading... What causes a car to have a check engine light? A loose gas cap, failing engine sensors, bad spark plugs, faulty valves such as in the EGR (exhaust gas recirculation) system, or intermittent misfiring could all be potential culprits. In this...