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Po 431 means one of two things. One the second cat is going out. Or mass air flow is sending high signal to the pcm. Even though the car might run good. It would be a great idea to replace it. This code pops up if you have more then 100k. Catillic converter usually should be change at this time anyways second cat can be bought chep. Use a universal one despite what the dealer might tell you, it would be perfectly fine. You want to check the g/m on the mass air flow sensor or just simplify clean it out using a mass air flow cleaner..

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