The Best 2007 Nissan Sentra Check Engine Soon Light Ideas. A loose gas cap allows fuel fumes to escape the fuel tank. The oxygen sensor is responsible for measuring the oxygen content in the exhaust gases.
Web if the check engine light (also known as the malfunction indicator light) comes on — either steady or blinking — while the engine is running, it might mean a malfunction with the emission control system. Depending on the make of your car you may see a “service due” or “service engine soon light” which pops up. If you have a flashing check engine light, turn off the engine immediately to prevent potential motor damage.
