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Originally Posted by afshinmoshrefi
How can you tell if Catalytic Converter is the problem or MAF sensor?
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Is what problem? If you have P017x codes for adaptation limits broken, the problem is not likely only a cat. Before one would have a variation in mixture significant enough to hit the limit due only to a cat it is likely one will already have P030x misfire codes. The answer in general is that one needs to observe the data. A fault code is a warning to observe the data.
An OBDII scanner is a crude but sometimes effective way to observe the data, otherwise one needs a diagnostic crystal ball. I can get a link to a company selling them:
http://www.auto-video.com/product_detail.php?id=26 