Swap them around, see if lean code moves to other bank

"New" now means NEVER tested, long ago it meant "tested and works", but those days are long gone
We have warranties now, which is another way of the manufacturer saying............"You test it for us, and we will replace it if it doesn't work"

 

What if it doesn't work? The o2's are in such stupid places. I needed help getting them off when i changed them...
Is there a way to just test it without removing it?

 

at least now they shouldn't be rusted in there. Should come out easier this time

 

well i'll have to wait because all of my tools are in my dads car and he at work unfortunately... Anything else i can look for in the mean time?

 

I was told that its likely i have a leaking head gasket if i'm only lean on 1 side? Also how could I have misfires with no code? Could my engine be vibrating because its just flat worn out?

 

?

 

Diagnosing headgasket is another thing. I'd do radiator pressure test first, then a compression check. And finally a leakdown test finally. Actually maybe start by removing spark plugs and arranging them in order to compare the tips.

 

I'm pretty sure I don't have any of those issues. I have no drivability issues whatsoever. Normal gas mileage, oil level, coolant level. I have no symptoms of head gasket but was told its possible. Idk what to do.

 

Ignore advice/comment, head gasket issue WILL cause overheating, and LOTS of white steam out the tail pipe

Just say thank you very much, and leave it at that