Trouble code P1406 means:EGR pintle position error
PO1406 ERG valve pintle position circuit error.
If that Buick has the 17 digit vin, the 8th digit would be the engine code.
Engine not reaching operating temperature.
Get a code read out from your engine computer and it will tell you what is wrong.
8th digit of VIN is engine code.
Trouble code P0108 means: MAP Sensor Circuit High Input
GA16de
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0307 means:Cylinder 7 misfire detected
Get an engine computer code read out . Could be a fuel sensor problem or even a mass air flow sensor. It could let you down if you don;t get it repaired.
The 2001 Buick Century came equipped with the 3100 V6 (engine code 'J'). The cooling system capacity is 11.6 quarts.
The country code and area code of Holbeach, United Kingdom is 44, (0)1406.