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Definition of check engine code P1511:
Alfa Romeo:
Idle speed control (ISC) actuator / idle speed control (ISC) actuator position sensor - circuit malfunction
BMW:
DISA (Differentiated Intake Manifold) Control Circuit Electrical
Chrysler/Dodge/Jeep:
Battery Sense Line 1
Citroen/Peugeot:
Idle Switch (Electric Control Throttle) Circuit Malfunction
Daewoo:
IDLE CHARGE ACTUATOR(ELEC)
Fiat:
Battery voltage below sensing
Ford:
Idle Switch (Electric Control Throttle) Circuit Malfunction
GM:
Throttle Control System - Backup System Performance
Hyundai:
Idle Control Valve Command Signal Shorted (Coil 2)
Mercedes:
Idle Switch (Electric Control Throttle) Circuit
Saturn:
Throttle Control System
Scion:
Boost Pressure Low.
Toyota:
Boost Pressure Low Malfunction
Volkswagen/Audi:
Intake Manifold Changeover Valve circuit electrical malfunction
Volvo:
Intake Manifold Changeover Valve circuit electrical malfunction
Subaru:
Idle Air Control Solenoid Signal 1 Circuit High Input