Question about 2004 Toyota Sienna
P0430 is saying that bank 2 catalytic converter has lost it's efficiency. if there are no exhaust leaks between the front and rear oxygen sensors and there are no programing updates for this code for your vehicle then you need a catalytic converter on bank 2. make sure to call your dealer to check for programing updates and to see if your converter is out of the federal emissions warranty which extends beyond your normal warranty.
Posted on Dec 31, 2012
My 2005 Sienna threw the same P0430 code. I found that our air filter was REALLY clogged and old. I replaced it and cleared the code with an OBD reader. The code came back 3 days later.
The sensor 1 bank 2 oxygen sensor is the easiest sensor to find and replace (even for someone like me with very little car repair experience). Since I'd heard that many people have trouble with after market O2 sensors I ordered the OEM Bosch sensor Part #15571) from AutoZone online. With an online discount code the part was $125 (cheaper than any other place I found).
It takes ~30minutes to swap in this new part. The sensor is right near the front of the Engine and fairly easy to remove. The hardest part is figuring out how to pop off the sensor plug and the small wire strap plug. This can be figured out a little more easily if you first get the replacement part (that includes the small replacement wire strap plug). You can see on the new part where the little plug levers need to be pushed to pop out the old part.
After popping in the new part and clearing the code again with the OBD reader the code has not reappeared with 6 days of driving. So I'm 90% sure the O2 sensor was the correct fix.
Unfortunately there doesn't appear to be a way to directly test if the O2 sensor is still good or not. But I hear that these sensors are only expected to have a ~60K mile lifetime.
Posted on Dec 07, 2014
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Posted on Jan 02, 2017
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