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Hello my name is Joe and I own a 2013 ford Taurus limited 3.5l v6. I had a po420 code pop up . I replaced 2 downstream sensors and light came back on along with po430. I then replaced both cats and all new sensors . Good for a day and two codes back on . What should I try next ? Any help would be greatly appreciated
 

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First hit on a google search of P0430:

 
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Hello my name is Joe and I own a 2013 ford Taurus limited 3.5l v6. I had a po420 code pop up . I replaced 2 downstream sensors and light came back on along with po430. I then replaced both cats and all new sensors . Good for a day and two codes back on . What should I try next ? Any help would be greatly appreciated
Since you replace the downstream senors. Replace the upstream sensor. Usually if you replace either one upstream or downstream. Replace both.
 
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