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Hey all I have an 09 XE just literally got it out of the dealer for warranty work on the trans (they replaced the old with new) and it's throwing codes for catalytic converter on bank 1 and bank 2 then 2 days later with out doing anything to it the check engine light went out just wondering if it could be the 02 sensors? Or should I proceed with the catalytic converters?
 

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I Just had a converter replaced. 2 years ago I had all 3 replaced. The mechanic told me the oil needs changed every 3000 miles on these cars because the dirty oil will make the coils misfire and make the converter go bad. How true this is Im not sure..lol My 02 sensors have never been replaced. I wonder if anybody else has had trouble with the catalytic converters multiple time?
 
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