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Subaru
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2021
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Forester Base
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System (Diagnostics) (1 Of 4)
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Diagnostic Procedure With Diagnostic Trouble Code (DTC)
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DTC P0140: O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
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Outline Of Diagnosis
Outline Of Diagnosis
Detect the open circuit in the rear oxygen sensor.