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Mazda
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2004
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6 i, 4D Sedan, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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On-Board Diagnostic [Engine Control System L3)
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DTC P0420: Catalyst System Efficiency Below Threshold
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Notes
DTC P0420: Catalyst System Efficiency Below Threshold: Notes
Fig 1: DTC P0420 - Detection Conditions & Possible Causes
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.