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DTC P0421 OR DTC P0431 Mazda 6 GG

Testing & Diagnostics

Note. Right front HO2S is identified as O2S11. Right rear HO2S is identified as O2S12. Left front HO2S is identified as O2S21. Left rear HO2S is identified as O2S22.

Code Definition

  1. DTC P0421: Right Side Warm-Up Catalyst System Efficiency Below Threshold
  2. DTC P0431: Left Side Warm-Up Catalyst System Efficiency Below Threshold

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