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P0240 Code

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valentin36:
Help
So my X finally popped the check engine light one for the first time
3 codes all the same one P0240
Catalyst Converter.
So how do I diagnosed this?
Im at 108k it seems to soon to go out? Right? Wrong? I dont want to replace it and that wasnt the issues.
Guy at autozone suggested 93 gas and a gas cleaner so i was thinking seafoam and see what happens.
Any other suggestions ??

knightrider:
Seems like alot of the xterra's have cat go around 100-150k.

93 octane will do nothing, you can try seafoam but that will most likely not help either, it will only clean out deposits from the engine an further clog the cats.

knightrider:
I would look and see if there are any vacuum or exhaust leaks, check spark plugs and make sure none are fouled.

valentin36:
Any recommendations
I checked rockauto and non are carb compliant with Cali.

knightrider:
Depending on your year magnaflow has carb approved cats, if you are newer your only option is OEM

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