Engine light with P0606, P0420, and P0430 codes.

I just bought an 05 Tacoma. I took a risk and bought it with an engine light on. The seller said it was an o2 sensor and having a diagnostic scan confirmed that. So I replaced the o2 sensor that was showing bad. The light went off for a while but then about 30 minutes later came back on. I had it scanned again, and now these codes are showing:

P0606, P0420, and P0430

The recommendation from the Autozone system says the P0420 and P04230 could be an exhaust leak, AF sensor error, fuel system fault, or a bad cat.

There was really no recommendations for the P0606 code.

Anyone have similar issues?

 

I had a P0420. Turned out to be the gasket connecting the cats to the Y pipe. Found a small soot patch.
As for the P0606, never seen it. Google to the rescue. Lol


I read some of this. You might want to as well.
https://www.iatn.net/forums/13/55176/toyota-p0606-dont-replace-the-ecm