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If I could also add. When codes are present, take MAF, for example, you cannot believe the data values you see on any scanner as the ECM is programmed to run on predetermined default values to keep the vehicle operable. Look at generic OBD II on your scanner and see if the values are different. You may be surprised. Another thing is to check the freeze frame data to see the conditions under which the codes were set. And third, look at the code setting criteria in service data to find out the conditions and number of “trips” necessary to set the code as well as what defines a trip. Good luck.
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