My P0430 popped up a couple weeks ago as well. Incidentally 2 days after my wife's car popped a P0446 (evap system issue). Apparently neither of our cars are excited about the environment right now, but I digress.
I am following the diag procedure from alldatadiy.com:
1. Do you have the code? == > Yes
2. Are there other codes? ==> No (they assume the O2 sensors are good unless another code is found)
3. Check the O2 sensors wiring harness. All OK? ==> Yes
4. Check the fuel pressure. Within spec? ==> ?
5. Check for exhaust leaks. Any found? ==> ?
6. Carry out the Catalyst Monitor Drive Cycle ==>?
I am thinking I may have a vacuum leak as well. I changed the spark plugs a couple months ago but did not replace the intake gasket when I had it off, so that is my next check. I will be replacing the gasket this weekend. I am also thinking that as my short term fuel trim on bank 2 is running just a bit lean as seen below.
View attachment 324433
Remember to adjust your ranges when looking at the O2 sensors as the range is really small if operating properly:
View attachment 324434
To check for vacuum leaks one thread I saw said spray some carb cleaner is short bursts around the intake plenum to see if the engine speeds up. I have not verified that or tried it but here is a mechanic talking about it so I may try that as well:
So my question that I have not gotten a straight answer to yet is if I have to check the fuel pressure, what PID is that in Forscan? I have not been able to find it. Alldata has me buying a special adapter to be able to hook up a fuel pressure gauge inline on the fuel rail, but since there is a fuel pressure sensor shouldn't the ECU report that value? Anyone know what PID it is?