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Scion
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2012
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tC Automatic Trans
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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 (Diagnostic Codes (P0010-P0504))
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SFI System
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DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1)
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Monitor Strategy
Monitor Strategy
Related DTCs
P0171: Fuel trim lean
P0172: Fuel trim rich
Required Sensors/Components
Air fuel ratio sensor, Mass air flow meter, Crankshaft position sensor
Frequency of Operation
Continuous
Duration
Within 10 seconds
MIL Operation
2 driving cycles
Sequence of Operation
None