The air-to-fuel ratio is more than just a number. The truth is, it's the key to getting the most out of every gallon of fuel. In short, it's the secret to excellent fuel economy. To measure the air-to-fuel ratio, there is a device called the Air Fuel Ratio Sensor.

The sensor is essentially an oxygen sensor, and it helps increase your fuel mileage. The sensor detects the current amount of oxygen in the air-fuel mixture. A signal is sent to a processing unit and the fuel injector can adjust the amount of fuel accordingly, depending on whether the mixture needs less or more fuel. This way, you can lessen your fuel consumption by providing a leaner stoichiometric ratio and avoiding excessive fuel injection. You save money, while extending the miles of travel. Since the sensor helps make the burning of fuel more efficient, it also helps in reducing your car's emissions.

These functions make the Air Fuel Ratio Sensor an indispensable automotive device.

 

Most cars use a MAF sensor to measure the VOLUME of air entering the engine and the air temp sensor to determine to density of the air charge. This info is used to determine the amount of fuel that is burned.

The heated O2 sensors (upstream) measure the amount of oxygen in the exhaust before entering the CAT to determine if the engine is in a lean or rich burn condition. The downstream O2 sensor measures the oxygen in the air after the convertor to see if it is doing its job correctly and eliminating the CO (by converting it to CO2 by using the excess oxygen).

If an engine is run too lean, detonation will occur and the engine will run hot. Driving it for extended periods in a lean burn state will usually burn a hole in a piston. Modern engine management sytems use the Mass Air Flow (MAF) sensors, Throttle Position (TPS) sensors, Oxygen (O2) sensors, anti-knock (detonation) sensors, Intake Air Temp (IAT) sensors and Idle Air Control (AIC) valves to control the engine. The ECU is also reading the values from the camshaft position sensor, speed sensor, ABS system, traction control system, engine coolant temps, oil pressure and fuel pressure (among others) to determine how the engine should be run.

 

Now I'm learning more about sensor. I can use this info for future reference.

 

well since that your knowledgeable about this sensors.. i just have a question regarding with one sensor under the engine..

im sorry but i really am confused, i tried searching for the answer but cant.
i bought an engine from a automatic car meaning ecu & throttle position sensor are for the auto setup. will this swap directly in my manual? will the ecu & tps from the automatic work with the manual tranny? Thanks in advance.

 

Oxygen Sensor helps to increase Fuel mileage and i appreciate your efforts to aware us about this system.

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