P0430 popped up randomly

[Nobuemon]

Hi everyone!

Got the P0430 code recently out of the blue, even though my headers got done a long time ago and I had no issues with it up until 2 weeks ago.
I read here that Big daddies garage's "solution" works for most people.

My question is whether I can get just one installed on the driver's side to get rid of the code, or if having two is a must to get it to work properly.

I don't have P0420, the only code besides that is about the active grille shutter being unable to fully open close(would unplugging it help btw?)

Thanks in advance!

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[Nagare]

I think each side can be done independently, but may as well knock them both out at once. I went with cheap ones off ebay and just reset the codes whenever they randomly pop up every couple of months.