Quote:
Originally Posted by upallnight
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If the exhaust place has the capability to run the test of back pressure (see video in the above) or similar appropriate test, yes, if not, there is a chance you will be buying a new cat that you don't need (I don't think that will be the case but it could).
If you replace the cat and it goes away, one of the two shops you visited that has the capability to run engine tests should test if there is still something going on that caused the cat to fail. Assuming the coils that were replaced were actually bad, the fuel not completely burned could have destroyed the cat.
To be sure it won't happen again, the engine should be checked to see if the root cause has been eliminated.