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2005
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Impreza WRX STI F4-2.5L DOHC Turbo
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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P Code Charts
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P1721
P1721
DTC P1721 DCCD ENGINE RPM SIGNAL SYSTEM CIRCUIT
DIAGNOSIS:
DCCD Open or short in engine speed output signal circuit
TROUBLE SYMPTOM:
The tendency of oversteer occurred when high speed cornering.
WIRING DIAGRAM