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I put on a new catylatic convertor, drove home and the check engine light came back on with the same code po430. Why?
Vehicle: 2007 Chevrolet trailblazer ss 6.0

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Hi there,

It is possible there is an issue with the rear O2 sensor, you may have installed it on the wrong bank. It is also possible that the code is a result of the different detergents and additives used in the fuel as the weather changes.

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