Our automotive experts have put together the following information about the P0430 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0430 code.

What Does P0430 Code Mean?

Fault Code Definition

The Bank 2 Catalytic Converter's emissions reducing efficiency has fallen below the minimum allowable threshold. This efficiency is tracked by a monitoring Oxygen Sensor that is mounted near the outlet of the Catalytic Converter.

P0430 Symptoms

  • Check Engine Light will illuminate
  • In many cases, no abnormal symptoms may be noticed
  • In some cases, there may be a noticeable lack of engine power

Common Problems That Trigger the P0430 Code

  • Defective Catalytic Converter
  • Internal engine damage resulting in high oil consumption and/or a leaking Head Gasket has damaged the Catalytic Converter

Common Misdiagnoses

  • Oxygen Sensor(s) are replaced when the real problem is a damaged Catalyst
  • Catalyst is replaced when the real problem is internal engine damage, which is producing elevated emissions levels
  • Catalyst is replaced when a misfiring engine is the real problem
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2 User Comments

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By , April 23, 2011
If you have P0430 or P0431 trouble codes. Try using SEA FOAM. Pour it into your gas tank and you will be good to go. I just used it on my 2002 Silverado and the check engine light went off with in 10 mile's. I bought it at advanced auto parts for $7.99 I hope this helps.
By , February 09, 2018
I also used sea foam ran the engine for about 30 mins. shut it off let it sit for awhile then when I started it the check engine light went off.