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Mazda
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2003
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B2300 Base, Standard
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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 P1128: Front Ho2S Signal
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Possible Causes
Possible Causes
Possible causes are:
Crossed HO2S harness connectors.
Crossed wiring at HO2S harness connectors.
Crossed wiring at PCM harness connector.
Poor terminal connection.