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Check engine or service engine soon light on. Before you spend a lot of money, try this: Remove your gas cap and re-tighten it, a loose or bad seal on the gas cap can set an evap code in your cars ECM or ECU causing a check engine or service engine soon light to come on.

please, I have a Nissan quest 2005 model, it blinks a light on d dash board which says service engine soon, please, how do I identify d gas cap dat u mention in ur comment , or wot do u tink I can do to stop Dis light blinking.