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2019
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WRX Base
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Repair and Diagnosis (Single Page)
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Engine Performance
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System
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Engine Control System (Diagnostics) (Except For STI) (2 Of 4)
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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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DTC P0420: Catalyst System Efficiency Below Threshold Bank 1
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General Driving Cycle
General Driving Cycle
Perform the diagnosis only once at a constant 40 km/h (24.9 MPH) or higher.