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.
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.
A code P0430 may mean that one or more of the following has happened:
First, inspect for exhaust leaks.
Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
Td
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