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Home › Mazda › 2003 › B2300 Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P1128: Front Ho2S Signal › 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.