In the old days, the fuel mixture was adjusted by hand using a device known as the "choke." It was usually located next to the "throttle." Although these words technically mean the same thing, when it came to the engines of those old vehicles, they performed two very different functions. The old hand throttle was like a mechanical cruise control - when you were out on the open highway, it was possible to open up the throttle - which was connected to the gas pedal - and give your foot a rest. By "throttling down," you were cutting off the supply of gas, slowing the vehicle.

The "choke," on the other hand, was used to cut off the air supply to the carburetor (remember those things?), thus creating a richer mixture (more fuel, less air). The choke was typically used to start the vehicle on cold mornings, but could be used to adjust the fuel/air mixture for different driving conditions.

Proper use of the choke required a lot of experience and a good deal of intuition - hardly a scientific way of using fuel efficiently. Nowadays, with gasoline between $2.40 and $3.00 a gallon, the idea of squeezing the most from every precious drop seems like a good one. Your Saturn SL Oxygen Sensor helps make this happen by measuring oxygen levels in the exhaust, then sending electronic signals to the fuel injectors. The injectors adjust the fuel/air mixture for the driving conditions of the moment, resulting in much greater mileage and power. You will not get a better deal on a Saturn SL Oxygen Sensor anywhere else.We will meet or beat any competitor's price on a Saturn SL Oxygen Sensor.