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2002
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Montero XLS
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Engine Performance
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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: Right Bank (Bank 1) Warm-Up Catalytic Converter Efficiency Below Threshold
DTC P0431: Left Bank (Bank 2) Warm-Up Catalytic Converter Efficiency Below Threshold