Auto Systems and Repair: P0423 - OBD-II Trouble Code

OBD II Fault Code

  • OBD II P0432

Fault Code Definition
Code P0432 indicates that the Bank 2 Main Catalytic Converter's emissions efficiency has fallen below the minimum allowable limit. This threshold is tracked by a Catalyst Monitoring Oxygen Sensor located on or near the outlet of the Catalytic Converter.

Symptoms

  • Check Engine Light will illuminate
  • In many cases, no abnormal symptoms may be noticed

Common Problems That Trigger the P0432 Code

  • Defective Catalytic Converter
  • Engine misfires have damaged the 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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