P0430: Catalyst System Efficiency Below Threshold (Bank 2)

What Does The P0430 Code Mean?

Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

What Are The Symptoms Of The P0430 Code?

You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

What Are The Potential Causes Of The P0430 Code?

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

How Serious Is This P0430 Code?

The conditions which lead to a stored code P042E may also result in serious drivability issues. For this reason, a code P042E should be addressed with urgency.

How Can You Fix The P0430 Code?

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.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Check This Video For Reference

P0430 Infographic - 1 Minute Summary

Reference Sources

P0430 Catalyst System Efficiency Below Threshold (Bank 2), OBD-Codes.