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3 i, Standard
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On-Board Diagnostic [Engine Control System]
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DTC P0421: Catalyst System Efficiency Below Threshold
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Except for California Emission Regulation Applicable Model
Except for California Emission Regulation Applicable Model
Fig 1: DTC P0421: Detection Condition & Possible Causes Chart
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.