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Mazda
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2003
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Protege LX, Automatic
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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 P0126 & DTC P0128
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Notes
DTC P0126 & DTC P0128: Notes
Code Definition
DTC P0126: Coolant thermostat stuck open.
DTC P0128: Coolant thermostat stuck open.