LEMON Manuals
: Even more car manuals for everyone: 1960-2025
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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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Engine Control System (Diagnostics) (P2101 To U0423) (2.5L)
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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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DTC P2271 O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2
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Component Description
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Component Description
Fig 1: Theoretical Air Fuel Ratio Graph
Courtesy of SUBARU OF AMERICA, INC.
Courtesy of SUBARU OF AMERICA, INC.