P0430 code

Ok guys I got a 2016 toyota tundra sr5 4.6L v8. At first I was throwing 3 codes P0137, P0157 and P0430 catalyst system efficiency below threshold bank 2. I bought bank1 sensor 2 and bank 2 sensor sensors hoping it would fix the problem. I got codes p0137 and p0157 cleared. But now I'm still throwing p0430. Which tells me I have a bad Catalytic converter in bank 2. But what I'm confused about is would that make me throw white smoke? and what catalytic converter is bad on bank 2? bc there is 2 on bank 2 and 2 on bank.

 

Also I've read somewhere that my up stream 02 sensors could throw that code as well. So I don't know I need help on what to do.

 

Top ones are the ones that go bad 1st and throw a code. Once those are replaced, but you still have a code after clearing them then the cat or cats are bad.

White smoke on cold start is vapor most of the time. Depending on weather, if it's cold enough it may be consistant, fair day may be gone after a few minutes.
If you're losing coolant and have white smoke, I'd have the intake valley checked 1st before dreading a blown head gasket, which are rare unless you've over heated.

 

I've learned that too. I'm not over heating so I don't think it's a blown gasket. But white smoke only happens when I throw the code p0430. I replaced the 2 downstream sensors. I'm thinking now it's my bank 2 sensor 1. But you think I should check my intake valley? I'm no mechanic and hope this isn't a stupid question but how would I go about doing that?

 

I'm about to check my radiator pressure test with dye. So I'll be able Eliminate that

 

Not a blown head gasket

 

Update: I found a small leak around the Catalytic converter weld. Could that be causing me to throw white smoke?

 

That could be causing the code as what's beeing pushed out is not matching both O2 sensors.

 

Yeah that's why I'm so confused.

 

Well, before you throw more parts at it, I'd get that crack repaired. Once repaired, clear the codes and see if they come back. If, they come back then reassess and see what sensors you will need, or just swap the sensors you replaced with the front ones and see if the codes come back.