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WRX STI
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Repair and Diagnosis (Single Page)
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Engine Performance
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System
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Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) (STI)
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Diagnostic Trouble Code (DTC) Detecting Criteria
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DTC P0030 Ho2S Heater Control Circuit (Bank 1 Sensor 1)
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Component Description
Component Description
Fig 1: Sectional View Of Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Courtesy of SUBARU OF AMERICA, INC.