Question

P2273 Chevrolet Silverado?

Answer 1

The purpose of the oxygen (O2) sensor is to monitor the amount of oxygen that is present in the exhaust. The air-fuel ratio is very important. Too much fuel will allow carbon monoxide to be emitted into the atmosphere. Too much oxygen will allow hydrocarbons and nitrogen oxides to be emitted into the atmosphere. The oxygen sensor will send information regarding the air-fuel ratio to the powertrain control module through a voltage signal. If the voltage signal indicates that the air-fuel ratio does not fall within the predetermined range that has been set by the manufacturer, the P2273 diagnostic trouble code will be stored by the powertrain control module (PCM) and the Check Engine Light will come on.