I had the same problem, i looked for a sending unit and could find none. I used a code reader but it doesn't send a code. The only way is check all you tire lbs even the spare then disconnect the battery for a few minuets and it should go away.
The low pressure AC port on a 2000 Buick Century is located on the accumulator. It is used to fill the system with refrigerant and to check pressure levels.
my century buick 2001 fail inspection because of a mil malfunction indicator lamp control cicuit how can it be fix also i also seen sumthing said it had to two indicator lamps
40 psi
You can add Freon to your 2001 Buick Century air conditioning system through the low pressure port. The low pressure port can be found on the top of the air conditioner compressor.
On my 99 Century 3.1l V6, the low pressure port is on the inverted "U" section of the low pressure line on the firewall near the EGR valve.
You should run between 30 and 35 PSI in the tires on your Buick Century. If you have older tires on the vehicle, you should run closer to the 30 PSI mark.
Pressure test system and watch for leak
The low tire pressure light on a 2002 Buick Century is reset by pressing the red button in the passenger fuse box. The light will return if the pressure problem is not fixed or if the leak comes back.
The low pressure is located on top of the accumulator. It is on the passenger side of the engine bay.
The AC low pressure port on a 1999 Buick Century is located on the side of the AC accumulator. This is positioned in the left, rear of the engine compartment.
The air pressure for many tires is 32 pounds. The sidewall of the tire will be stamped with the correct pressure for the tire.
Evap Emission Control System Pressure Sensor Low