code 0422 is catalytic conv under threshold code. I have a 2000 V70 XC SE with 80k miles and for the past few months-the same code pops up. I have a the code scanner to re-set the code. I took the car to a Indy volvo shop near me and was told that it needs a new cat within the next 5000k miles. Iv read here and there that that code would actually require the o2 sensor changed first-and see if that takes care of it. Fact is-car runs perfect-always has-getting 26 mpg on the highway and 22 mpg around town-and have to think about what is best to do myself on this. Good luck-Happy New Year
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