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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.