Question about 2004 Toyota Sienna

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Code P0430 Low catalyics

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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

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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

  • Matt Felder
    Matt Felder Dec 13, 2014

    I spoke too soon. The check Engine light came back on about 7 days later. It's now in the shop getting a replacement catalytic converter and a different O2 sensor. The bill will be ~$1000.

  • Matt Felder
    Matt Felder Feb 11, 2015

    Ugh. After this repair bill the van ran great for ~7 weeks and then the check engine light came on yet again. The shop said that the OTHER catalytic converter needed to be replaced.... another $1K bill. I probably would have sold the car first had I known that both would need replacing. This was painful.

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Christopher, BMW P0430 code catalyst efficiency fault, the converter is no longer able to do its job and may need replace.
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As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

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Check out related help links to troubleshoot these common error OBD code noticed on many brand vehicles:------
1998 GMC K1500: OBD Error Code P0430? http://schematicsdiagram.blogspot.in/2012/06/1998-gmc-k1500-obd-error-code-p0430.html

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These will help.
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P0430 - Catalyst System Efficiency Below Threshold Bank 2

The ECM or PCM monitors the switching frequency ratio of heated oxygen sensors 1 and 2.

A three way catalyst converter(Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst (Manifold) malfunction is diagnosed.

catalytic_converter.gif

Possible Causes:
- Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module

Possible Solutions:
The most common cause it the three way catalyst converter Bank 1.

If the P0430 is combined with other DTC's try fixing those first and this code may clear.

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