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Codes are what tell you If there is something wrong with your car.There is a little light in your gauge cluster that says check engine.When it is lit that means that the computer is giving you a heads up on a problem.You hook up a on board diagnostic scanner to the computer via a plug on your firewall under the hood for OBDI or under your dash for OBDII.The reader will tell you the code.Autozone will hook up the scanner and read the code for you and they have books on the codes so they can look it up for you.
 
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