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Mazda
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2005
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6 i, 4D Hatchback, Standard
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Repair and Diagnosis (Single Page)
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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 P0421
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Notes
DTC P0421: Notes
Fig 1: DTC P0421 [L3] Detection Condition & Possible Causes
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.