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I've read this is a catalytic converter gone bad from a bad coil. That I had changed with the computer also. If it is, is it the front or back converter?

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Luckily this is the radiator-side bank, the "easy" one. How long ago did you change the PCM and coil(s)? No other codes since then?

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It was 2014 when I had the coil/pcm go out and had those fixed. At that time I didn't need and inspection.

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I haven't pulled codes in a while to make sure. What is a good catalytic converter brandto get?

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I always went with OEM, most aftermarket warranties can be kind of iffy, at least with Eastern & Walker. I'd be ok with Magnaflow though. Hope your state does not require CARB compliance, might have to stick with OEM.

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Any possibility that this might be the O2 sensor instead?

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A code P0430 may mean that one or more of the following has happened:

 

The catalytic converter is no longer functioning properly

An oxygen sensor is not reading (functioning) properly

There is an exhaust leak

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O2 sensor is really cheap compared to a cat. Might want to try it first. Then if not it at least you will have a new O2 to go with a new CAT.

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