LEMON Manuals
: Even more car manuals for everyone: 1960-2025
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Mazda
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2002
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MPV LX
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Repair and Diagnosis (Single Page)
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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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Possible Causes
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Possible Causes
Exhaust system leaks.
Front HO2S malfunction.
Loose front or rear HO2S.
Warm Up Three Way Catalytic (WU-TWC) converter deterioration or malfunction.