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Mazda
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2003
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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 P0051: Left Front Ho2S Heater Circuit Low
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Possible Causes
Possible Causes
Faulty left front HO2S.
Open between ignition switch and left front HO2S.
Open or short between left front HO2S and PCM.
PCM malfunction.