?? Oxygen sensor to detect the concentration of oxygen in the exhaust, the feedback signal sent to the ECU, then controlled by the ECU injector fuel injection quantity of the change, which will control the mixture air-fuel ratio near the theoretical value. Let's us see oxygen sensor of the role.

?? Oxygen sensor of the EFI cars for high exhaust purification rate and reduce the exhaust (CO) carbon monoxide, (HC) hydrocarbons and (NOx) NOx components, must make use of catalytic converters. However, in order to effectively use catalytic converters, air-fuel ratio must be precisely controlled, it is always close to the theoretical air-fuel ratio.