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I got the engine code P0420 on my 2000 Chevrolet Monte Carlo 3.4L, I've changed both O2 sensors and the cat light comes back on what next

Vehicle: 2000 Chevrolet Monte Carlo 3.4L

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HI there,

If you still have a light coming on for a bad converter, then it's time to replace the converter. After a while they don't clean the system well enough and you will still get that code.

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