P0421 and P0431 codes - 6SpeedOnline - Porsche Forum and Luxury Car Resource

Mar 21, 2021 | 12:51 PM

cayenneshybridmik

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P0421 and P0431 codes

Hello,

I have a 2012 Porsche Cayenne S Hybrid. My secondary cats were bad, so that car was running rich. I took the car to the exhaust shop, and they cut them, and make it straight. Now, I am getting P0421 and P0431 codes. There is no oxygen sensors on the secondary cats, so i wonder why or how i am getting these errors. Is it normal ? What should I do ?

thanks