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Home >> Mazda >> 2004 >> 3 i, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0421: Catalyst System Efficiency Below Threshold >> Except for California Emission Regulation Applicable Model
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Except for California Emission Regulation Applicable Model

Fig 1: DTC P0421: Detection Condition & Possible Causes Chart
G00975267Courtesy of MAZDA MOTORS CORP.
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