PO430 code

2003 SR5 4.7. 240K miles and owned it since new. Very well taken care of. Started throwing the PO430 code months ago. Replaced the Bank 2, Sensor 2 O2 sensor. Got another code for the same sensor about 30 mile later. This past Sunday I replaced the cats and resonator section of the exhaust (O2 boss was rotted out), removed and cleaned the throttle body, installed new valve cover gaskets while I was at it, installed a new sensor then then cleared the code. About 30 miles later the code is back.
Any ideas? Could this be a fuel injector problem? New injectors wouldn't hurt but I don't want to chase this with $$$ and my emissions test is coming up.
Thanks.

 

For those following, nothing appears to have changed since 5 days ago in original thread.

Bank 2 sensor 2 issues

 

You could try an 02 sensor spacer, it makes it so the sensor isn’t in the middle of the stream, more towards the edge and can fix the dash light problem (but not the actual problem). Worked in a Jeep I had.

 

Most of these code threads baffle me. Not knocking the OP here, but usually what I see is:

1) Code thrown

2) Parts installed

3) Code goes away (or does not)

4) Code comes back (after ECU reset?)

So, I am assuming either:

1) A thrown code has multiple issues surrounding

2) Thrown code is a general and not specific direction.

These exhaust codes threads seem the trickiest. I meditated on Blown Head Gaskets Research one time, but couldn’t handle the thought of one going bad on my truck so I had to stop.

 

From https://www.obd-codes.com/p0430 :

A code P0430 may mean that one or more of the following has happened:
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak

This may be totally off-the-wall, but what is the service history on the secondary air injection system? As @Professional Hand Model said, these codes are all over the place, and sometimes seem unrelated. If yours has never had any air injection system issues, it's a miracle.

 

What replacement cats did you put in? I've seen reports of aftermarket converters not being efficient enough to bring the O2 readings back within spec even though the original cat(s) were indeed bad and needed replacing. I used a magnaflow catted mid pipe to replace my passenger side factory cat when getting the p0420 code it indeed fixed the problem.

 

My jeeps p0420 code was a result of installing a k&n cold air intake. I’ve also read of another user on here that switched air filters and got p4xxx code.

 

Isn't that only on VVTI engines? His 02 won't have that.

 

Yeah, he has a 2003, but you're right. Further research shows that SAIS started on Tundras in 2005. My initial stab at confirmation showed 4.7L Sequoia with SAIS as early as 2000?, but apparently not for Tundra. It was an idea...or a brain fart.

 

What brand O2 sensor are you installing? I've heard these trucks dont play nice with certain brands (Bosch)

 

This answer is a critical one.

 

Just curious....what is an "bad O2 boss". The OP has mentioned fixing/working on that item in their other thread and this thread also. Google doodle don't help me diddly ?

and possibly which particular ones and any other codes ?​

 

From the context, I interpret "boss" to be the half coupling or collar welded into the exhaust piping for mounting the O2 sensor.