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Powertrain / Under The Hood • Re: Dreaded 0430, please help.

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Update:

I’m hoping somebody can explain to me the delineation between some I/Ms and their relationships to the code/systems they impact.

I have now replaced the cat, as well as the evap purge valve solenoid, and the canister vent valve solenoid.

I put it through a few more drive cycles, including a recommended 500 or so mile break in for the cat, and I still have the code coming back.

The thing that I’m getting lost in now, though, is that my I/Ms are all passing except for the evap.

The catalyst monitor is passing, and so I don’t understand how I keep getting recommendations to replace the cat again with a more expensive one and hope that I just got a bum one this time.

If that metric is pulled from downstream o2, as I think I read, would that not fail if the cat was not heating and functioning properly?


I took it to a shop that did a diag and simply cannot find an alternative reason given the code presented, which makes sense to me. 0430, cat issue. But also, why the hell is that code still present if what I’m failing is an evap monitor?

I read that this type of perm code could take like 80 trip cycles to sort out, and I wonder if the perm code regeneration is that overlap, but it also doesn’t explain why I’m still getting the current 0430, not just the perm, but failing on evap I/M.

I’m still having what look like some interesting fuel trim readings, and wondering if a PCM might be part of the issue, but I’m not sure if the PCM is unrelated to the code vs monitor thing.

Any help would be massively appreciated.

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