Hi,
It's possible because a leak at the purge valve can cause a lean fuel mixture which is offset by the computer trying to compensate (adding fuel).
Here is what I suggest. Before replacing the converter, let's get the purge valve taken care of, clear the codes, and see if the P0430 returns.
If you look below, it is the diagnostics for the P0497. It requires a scan tool that can command systems on and off. Additionally, a vacuum pump will be needed. Oftentimes, a parts store will lend you one.
Let me know what you find or if you have other questions.
Take care,
Joe
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Saturday, May 22nd, 2021 AT 9:11 PM