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Definition of check engine code P1781:
Chrysler/Dodge/Jeep:
Pressure switch circuit: OD
Citroen/Peugeot:
4X4 Switch Out of Self Test Range
Daewoo:
ACTUATOR MAL
Ford:
4X4 Switch Out of Self Test Range
GM:
Engine Torque Signal Circuit
Lincoln:
4x4 Low Switch is Out of Self-Test Range
Mazda:
Transmission 4x4 Low Switch out of Range Fault
Mercedes:
Upshift delay switchover valve (AT/CC) (Y3/5)
Mercury:
4x4 Low Switch is Out of Self-Test Range
Oldsmobile:
4x4 Low Switch is Out of Self-Test Range
Opel:
CAN data bus,ECM actual torque signal - malfunction detected
Volkswagen/Audi:
Engine Torque Reduction Open / Short to Ground
Volvo:
Engine Torque Reduction Open / Short to Ground
