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Definition of check engine code P1721:
Chrysler/Dodge/Jeep:
Line Pressure Sensor Circuit (old)
Citroen/Peugeot:
Gear 1 Incorrect Ratio
Daewoo:
CONTROL RELAY
Ford:
Gear 1 Incorrect Ratio
Lincoln:
Gear 1 Incorrect Ratio
Mercedes:
Gear 1 Incorrect Ratio
Mercury:
Gear 1 Incorrect Ratio
Oldsmobile:
Gear 1 Incorrect Ratio
Volkswagen/Audi:
Wheel Speed Signal 3 Range / Performance
Volvo:
Wheel Speed Signal 3 Range / Performance
GM:
Solenoid "B" Controlled Clutch Not Engaged