Gasoline engines sprint greatest when the air-fuel combination is correct. The air-fuel combination must be prohibited to decrease exhaust contaminant emissions. Lowest emissions are achieved with a slightly lean combination. The catalytic converter, an important part for emission control, also likes a prohibited lean air-fuel mixture. The oxygen sensor detects the air-fuel combination of a gasoline engine by measuring the quantity of oxygen in the exhaust gas.

The car's fuel-injection method picks a voltage to contrast with, and modify the mixture to try to preserve an on-off ratio close up to 50%, so if you averaged the power over time it would be about 420 or 450 mV. The on-off transition happens about one or two times per second in your car when it's running correctly.

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