Where can I find a car oxygen sensor in Changsha?

You can find it in the auto parts city.

Oxygen sensor is an important component in an engine that uses a three-way catalytic converter to reduce exhaust pollution. Once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for CO, HC and NOx will drop sharply. Therefore, an oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust gas and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection quantity of the injector, so as to control the air-fuel ratio of the mixed gas near the theoretical value.

The function of the sensor is to determine whether there is excess oxygen in the exhaust gas after engine combustion, that is, oxygen content, and convert the oxygen content into voltage signal and transmit it to the engine computer, so that the engine can realize closed-loop control with excess air coefficient as the goal; Ensure that the three-way catalytic converter has the maximum conversion efficiency for hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOX) in the exhaust gas, and convert and purify the discharged pollutants to the greatest extent.