If I were to make a list of the most common problems to set a DTC, I would say that oxygen sensors, mass airflow sensors and the evaporative emission system would probably be at the top of that list. Many times I have read codes that say “Evap Emission System-small leak” and find that the cause is a loose gas cap or one with a worn gasket and not sealing properly. Now I am certainly not saying that a check engine light cannot be caused by a serious problem, because it can.
For instance, a DTC may be related to an abnormal reading from an oxygen sensor. The problem could be as simple as a bad sensor or could be more serious and costly such as a bad catalytic converter or an exhaust leak. My intention in this short article is to make the car owner aware that when a check engine light comes on it could be a relatively simple problem or it could be a more serious and costly problem. Only a through diagnosis by a good shop can give you the anwser. For more detailed information please visit the following links.
http://www.obdii.com/dtctypes.html http://www.autotap.com/techlibrary.asp
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