Witte2Performance
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Mazda
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2002
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MPV ES
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics
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Diagnostic Tests
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DTC P0421 Or DTC P0431
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Notes
DTC P0421 Or DTC P0431: Notes
Code Definition
DTC P0421: Warm Up Catalyst System Efficiency Below Threshold - Right Side
DTC P0431: Catalyst System Efficiency Below Threshold - Left Side