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P0431 - OBD-II Trouble Code

Our automotive experts have put together the following information about the P0431 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 P0431 code.

What Does P0431 Code Mean?

Fault Code Definition

Code P0431 is triggered when the Bank 2 Warm Up Catalytic Converter's emissions reducing efficiency has fallen below the minimum allowable threshold. 

P0431 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 P0431 Code

  • Defective Warm Up Catalytic Converter
  • Engine misfires have damaged the Catalytic Converter

Common Misdiagnoses

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

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