AND LOW COOLANT LIGHT COMES ON SOMETIMES TO
Sounds like the thermostat needs replaced. You may also want to check you MAF sensor.
SOURCE: We have a 1997 Buick
Well the code is another problem. Remove the coolant overflow bottle and clean it out good with hot water and some soap you should notice that there is a sensor in side of it and on some older cars over time they get gumed up and wont read right try this first if it wont work you will have to buy a new one.
SOURCE: Low Coolant light flashing on 1996 Buick Regal 3.8
The low coolant sensor should be located in the passenger side radiator tank, You need to take it out and clean the sludge off of it for it to work right. Or you can just unplug it and forget about it, the light will go out and it won't cause any problems.
SOURCE: my low coolant light is flickering on and off. I
The sensor should be easy to find, check it's connection. A Chilton book will have the schematic for your car, and you can track the circuit for the sensor.
SOURCE: Low coolant sensor on a 1998 buick
The coolant sensor should be located near where the upper radiator hose is attached to the engine and has a wire connector on it with 2 wires. It's the only sensor near there. Then there's the sensor that'll be attached to your reservoir tank somewhere along the firewall
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SOURCE: buick regal 92 3.8L Horrible fuel mileage
Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.
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