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If catalytic converter is bolted on you can check them by taking them off and checking for cracks in the passage ways, if it is welded or you don't want to take them off to check you can take a drill and make two small wholes; one in front and one behind the CAT (be sure not to drill in the CAT, but in the pipes in front and behind it) get a pressure gage designed for such a job, [while the vehicle is running] check pressure of both holes, if the rear hole has a considerably lower pressure reading than the front reading then you know that the passage way is being blocked, you will see that the pressure in the front hole will be considerably greater this is because the gases are building (one or two psi difference isn't bad 5 or more lbs difference you might consider taking to a local muffler shop who can hook you up with a universal CAT!)

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Q: How do I you tell if catalytic converter needs repair?
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