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Home › Mazda › 2003 › B4000 Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0133 Or DTC P0153 › Possible Causes

Possible Causes

Possible causes are:

Contaminated HO2S.
Deteriorating HO2S.
Exhaust leaks.
Improper fueling.
Intake air leaks.
MAF/IAT sensor.
Shorted or open wires.