Engine failure lights, idle mixture concentrated, resulting in a mixed gas concentration is usually the cause of the fault before the oxygen sensor, fuel injectors clogged or resistor failure, the engine computer failure, etc., in order to repair the fault sensors and injectors majority, use the diagnostic tool
to determine the cause and analyze the necessary data and measurement process, as suggested by the service shop technician repairs and testing, they are more professional. Another reminder recently because of the gasoline engine fault light of reason more, but mostly caused by clogged injector coking dilute mixture, throttle naturally by the carbon. Concentrated mixture of small, generally throttle jitter mostly carbon reason, testing is also very easy to just look at the opening of the can. I hope the answer to help you.