2006 Tundra P0430

I have an 06 Tundra that is throwing the P0430 code bank 2. I took it to a mechanic shop and the guy told me it was the catalytic converter. They cut off the old one and placed a new one, but the code came back on the next day.

I took it back and left it there for about 4 days so they could figure it out. They replaced both the upstream and downstream sensors. I drove it for about a day and the light came back on. The guys at the shop were stumps and placed my old sensors back and refunded me my money. Unfortunately the light is still coming on and I have no idea why.

I've noticed the light usually comes back on after i hard rev the truck to quickly accelerate. The light went away on it's own for about 2 days, and then after I hard rev'd again, the light came back on.

Any ideas on what could be causing the code to come on?

 

Any other issues going on with it? Here is a page that has lots of info on this code.

https://www.700r4transmissionhq.com/p0430-toyota-tundra/

 

No, the truck runs and drives without any issues. There are no other codes that show up. There's no hesitation or loss of power.

 

From the above link... (my first guess is wiring)

• O2 Sensor Wiring– Over time, the oxygen sensor wiring can go bad. It is especially volatile since it is right next to the hot exhaust at all times. The downstream oxygen sensor wiring is especially volatile since it is so far from the ECM (more distance to travel.
• Timing– If your Tundra is misfiring or the exhaust timing is off, this can affect the gasses that are actually going to the O2 sensors enough to cause the P0430 code to register.
• Exhaust Leak– If there’s a noticeable exhaust leak coming from the vehicle it can change what the O2 sensors register enough to throw the P0430 code.
• Engine Temp Sensor– If the computer doesn’t know what the engine temp is it’ll keep the fuel mixture rich. When the fuel mixture is rich, the exhaust the O2 sensors see will be out of range and it could throw the sensor.

 

The wiring could be it. I'll take it to an electrical mechanic and see what they tell me.

The truck isn't misfiring so I don't think it's the timing.

The exhaust leak could be it, but I think the mechanic shop I took it to would of caught that. They are a muffler shop after all.

How could one tell if the temp sensor is bad? is that different than the thermostat?

 

Temp sensor could also be a culprit. There are some on Rockauto that are cheap and its not difficult to change it.

https://youtu.be/1UCW59kaX0E

 

Found another video on possible sources of error code P0430

https://youtu.be/-ZWKablBkwE

 

I swapped the Temp sensor. but I was wondering.. the one they gave me in O'reilleys was thicker than the one the truck had on. It went in just fine and the connection fit as well. Does the thickness of the sensor matter?

 

Any movement on this? I have an '06 DC that giving the same troubles.

 

Well yes and no, I took it to another shop that was supposed to be more specialized. He told me that the converter they installed was the correct one for vehicles that are not CARB compliant. Unfortunately, my truck is for some reason. He said to get a CARB compliant it would cost around 1.4k.. which I was not willing to pay. So what I ended up doing was using the spacer trick using 2 spark plug anti-foulers. I figured that since my converter was fine this could give it that extra umpth to no trigger the code. I installed it and cleared the code, and 10k miles later it hasn't come back. I live in Texas and we don't have an emissions test, they only go by whether the light is on or not, so this worked for me.

https://www.youtube.com/watch?v=TxUya70kkQk

 

You need a scan tool to monitor Air Fuel Sensor bank 1 Sensor 1 and O2 sensor B1 sensor 2. You also need to monitor fuel trims.

 

One way to test your intake for sucking air at the gasket, spray WD40 or other low volatile substance around the intake gasket. If idle increases you have a leak. I wouldn't recommend starting fluid or brake cleaner, it might ignite and that would be a mess.