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Definition of check engine code P1661:
Chrysler/Dodge/Jeep:
Sensor Ground Reference Circuit
Citroen/Peugeot:
Output Circuit Check Signal Low
Ford:
Output Circuit Check Signal Low
GM:
MIL Control Circuit
Lincoln:
Output Circuit Check Signal Low
Mercury:
Output Circuit Check Signal Low
Oldsmobile:
Output Circuit Check Signal Low
Scion:
EGR Circuit.
Toyota:
EGR Circuit Malfunction
Volkswagen/Audi:
Engine coolant blower motor,speed 2 - short to positive